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Fast Dirt: Testing Zwift’s Rolling Resistance Changes

Fast Dirt: Testing Zwift’s Rolling Resistance Changes

Zwift’s physics, like outdoor physics, are influenced by many factors including rider weight, virtual bike choice, power output, and virtual environment (gradient, air resistance, rolling resistance, etc).

Yesterday’s Zwift update to game version 1.52 included three notes about rolling resistance changes:

  1. Reduced rolling resistance proportionally across road, gravel, and mountain bike wheelsets when riding on dirt road types.
  2. Reduced rolling resistance for the ENVE G23 wheelsets to match other gravel wheelsets on gravel and dirt road types. 
  3. Corrected the rolling resistance of the Zwift Mountain bike wheelset on brick road types.

The first change is the biggest news, but I’ll cover all three notes below. Let’s dive in!

Faster Rolling Dirt

Rolling resistance is known as “Crr” in the cycling world (read all about Crr on Zwift), and yesterday’s update significantly lowered the Crr of dirt surfaces throughout Zwift. Here is a table showing the old and new dirt Crr values for each of Zwift’s three main bike types:

Old CrrNew Crr% Crr ReducedWatt Reduction*
Road.025.01636%80W
MTB.014.0129%36W
Gravel.016.01225%36W

* “Watt Reduction” represents how much less power riders will need in order to travel at 40kph with the new Crr values. This assumes a 75kg rider on a 7kg bike.

While this change has made the dirt roll faster for all bike types, the change isn’t as “proportional” as Zwift’s note may imply. As you can see, road bike riders are saving 80W with this change, while MTB and gravel riders are saving 36W.

Another way to look at it: if you’re on a road bike going all-out while climbing up the Jungle road (a regular occurrence in races), this change gives you back 80W that would have previously been used to overcome rolling resistance. That’s a lot of watts!

So, how much faster is the dirt? We ran some tests with our bots, using a 75kg rider holding 300W steady.

Our first test was on Makuri Islands’ Kappa Quest route, which features the map’s key dirt section (the Temple KOM climb) plus some tarmac. It’s a great test route to show how changes in rolling resistance affect particular sections and overall lap times on mixed-surface routes.

Old Kappa Quest Times

BikeClimbDescentForestTarmacLap
Zwift Concept Z1 Tron (Road)7:362:241:535:1217:05
Trek Supercaliber (MTB)7:112:201:465:3816:55
Specialized Crux (Gravel) with
Zwift Gravel wheels
7:112:221:495:2916:51
Specialized Crux (Gravel) with
ENVE G23 wheels
7:012:211:485:2716:37

New Kappa Quest Times

BikeClimbDescentForestTarmacLap
Zwift Concept Z1 Tron (Road)6:552:171:455:1216:06
Trek Supercaliber (MTB)6:522:171:435:3316:25
Specialized Crux (Gravel) with
Zwift Gravel wheels
6:432:181:445:2716:12
Specialized Crux (Gravel) with
ENVE G23 wheels
6:432:181:445:2716:12

A few notes on the results above:

  • Previously, the Tron bike was 35 seconds slower up the Temple KOM compared to the Crux gravel bike. Now that gap has shrunk to just 12 seconds, which is right around how long it takes a well-trained rider to swap bikes in Zwift.
  • The Tron bike essentially matches the gravel and MTB’s times on the descent, thanks to its superior aerodynamics and newly-reduced Crr.
  • Zwift has updated their stock gravel wheels to match the name-brand gravel wheels, so all available gravel wheels perform identically. This is probably a good move. Less confusing!
  • You may notice this week’s update also made the MTB faster on tarmac. More on that below.

Jungle Lap Times

Of course, the Mayan Jungle is where Zwifters encounter dirt most often. This is especially true now that Zwift has opened up their southern coast road! How did the dirt Crr change affect Jungle speeds? We did some test laps of the Jungle Circuit:

BikeOldNewDifference
Zwift Concept Z1 (Road)14:57.813:35.51-1:22.3
Scott Spark RC (MTB)13:53.0913:18.05-0:35.0
Specialized Crux (Gravel) with
ENVE G23 wheels
13:53.6313:20.22-0:33.4

Wow! While all three bike types got faster, the road bike got much faster.

To Swap, or Not To Swap?

Prior to this week’s change, riders would often swap to a gravel or MTB when hitting key dirt sections like the Temple KOM or Jungle Circuit in a race. If you were able to swap quickly this was a smart move in many situations, since you could put a lot of time into your non-swapping competitors.

But given the results above, does it make sense anymore to swap from a road bike to a gravel or MTB when hitting the dirt?

Probably not. Certainly, if you’re in a situation where you’ll need to swap from road to gravel/MTB then back again, a swap no longer makes sense because you aren’t saving enough time swapping to make up for the cost of both swaps (approximately 25 seconds).

With that said, swapping may make sense if it’s a one-way swap. For example, if you’re in a Makuri Islands race that finishes atop the Temple KOM, it may make sense to swap to a gravel bike when you hit the dirt, since you can stay on that bike all the way to the finish line. (This would especially make sense if you’re going for a fast segment time and make the swap before the KOM start line).

ENVE G23 Fix

Zwift’s update 1.51 included a config error for the ENVE G23 gravel wheels – they didn’t get updated to roll faster on gravel like all the other gravel wheels. This week that error was fixed, so now the ENVE wheels match the performance of all other gravel wheels.

I already mentioned this above, but it’s worth noting again that Zwift also changed their Zwift-branded gravel wheels to match the performance of the name-brand gravel wheelsets, so all the gravel wheelsets now perform identically.

Faster MTB Wheels

Zwift says this week’s update “Corrected the rolling resistance of the Zwift Mountain bike wheelset on brick road types” but it would be more precise to say Zwift has made their MTB wheelset roll slightly faster on nearly all surfaces.

Along with the dirt change already noted above, this week’s change reduces the MTB wheels’ Crr from .01 to .009 on the following surfaces: Pavement, Sand, Brick, Wood, and Cobbles.

You still won’t be seeing many mountain bikes out there on Zwift roads, but at least they’ll be a bit faster.

Questions or Comments?

What do you think of Zwift making their dirt faster? Will you be doing any swapping in the future? Share below!


Zwift Update Version 1.52 (122317) Released

The latest Zwift update has been announced and will be released in phases over the next few days. Starting this week, Zwift will be rolling out releases on Tuesdays instead of Wednesdays.

This release doesn’t include new features, but makes changes to how Zwift works in areas like rolling resistance, HUD elements, and steering. Let’s dive in!

Rolling Resistance Changes

Zwift’s release notes say, “Reduced rolling resistance proportionally across road, gravel, and mountain bike wheelsets when riding on dirt road types.” There are two additional rolling resistance-related notes as well, and we’ve included them below along with a note from us:

  • Reduced rolling resistance for the ENVE G23 wheelsets to match other gravel wheelsets on gravel and dirt road types. This is just a fix for a config error introduced in version v1.51. Now the ENVE wheels match the performance of all other gravel wheels.
  • Corrected the rolling resistance of the Zwift Mountain bike wheelset on brick road types. Zwift actually adjusted the Crr of the MTB wheels on all hard surfaces, dropping it from .01 to .009. So the MTB will be slightly faster on pavement, brick, wood, cobbles, and sand… but still quite slow compared to road or gravel bikes.
SurfaceOld Road CrrNew Road CrrOld MTB CrrNew MTB CrrOld Gravel CrrNew Gravel Crr
Pavement.004.004.01.009.008.008
Sand.004.004.01.009.008.008
Brick.0055.0055.01.009.008.008
Wood.0065.0065.01.009.008.008
Cobbles.0065.0055.01.009.008.008
Ice/Snow.0075.0075.014.014.018.018
Gravel.012.012.009.009.009.009
Dirt.025.016.014.01.016.012
Grass.042

This is bigger news than the gravel resistance changes in version 1.51, because the dirt surface is used in more places on Zwift, including notable sections like the Mayan Jungle and Makuri Islands’ Temple KOM.

How much has rolling resistance changed on Zwift dirt? Quite a lot – especially for road bikes.

Old CrrNew Crr% Crr ReducedWatt Reduction*
Road.025.01636%80W
MTB.014.0129%36W
Gravel.016.01225%36W

* “Watt Reduction” represents how much less power riders will need in order to travel at 40kph with the new Crr values. This assumes a 75kg rider on a 7kg bike.

Why the change? We think it’s because Zwift has heard many Zwifters saying, “We love the new coastal road, but don’t like slogging through the slow Jungle.” These Crr changes will speed up the Jungle significantly, especially for road bikes, possibly bringing an end to the Zwifty practice of bike swapping.

Learn more about these changes by reading our followup post, “Fast Dirt: Testing Zwift’s Rolling Resistance Changes.”

Power Display

We previously noted that Zwift’s power numbers were updating rapidly (several times per second) when connected to trainers like the Zwift Hub or Wahoo KICKR which broadcast at higher frequencies (aka 10Hz “race mode”).

Today’s update reduces the refresh rate to approximately 1Hz if you have power display set to 3 seconds, while preserving the instantaneous updates if you’re set to “instant”. As it should be.

Watopia Expansion Cleanup

Heading out from the Jungle to the new coastal road

As often happens after a big expansion, Zwift had some cleaning up to do once Zwifters began exploring the new tarmac. Three minor improvements were made on the new southern coast road:

  • We mowed – and then paved over – the grass that was incorrectly growing on one section of roadway.
  • Fixed an issue that could cause black squares to appear in some areas.
  • Improved rendering and reduced frequency of objects and buildings “popping in” on approach.

Steering Improvements

Zwift continues to improve the game’s steering functionality, with every update including a note or two about steering changes. Here are the two notes from today’s update:

  • Fixed an issue that could potentially cause Zwifters with steering enabled to get pushed toward the center of the road when drafting a rider to their left.
  • Zwifters can now filter events based on whether steering is required or not.

Slowing the Band(its)

Zwift says this update, “Improved the behavior of the “Keep Everyone Together” (i.e. rubber-banding) option in group rides to maintain more realistic speeds on routes with high gradients like Alpe du Zwift.”

Our guess is this is aimed at rides like Sunday’s BanditZ Tronathon, a social banded ride which takes riders up Alpe du Zwift. While Zwift doesn’t say whether this change is intended to slow riders down or speed them up, our money is on banded rides being slower up the Alpe.

More Release Notes

Zwift provided notes on additional tweaks and bug fixes in this update:

  • Zwift Hub: Zwifters who use Play controllers with Zwift Hub updated to firmware 5.2 or newer will now receive an in-game tutorial introducing them to Virtual Shifting and letting them choose whether to have it enabled or disabled by default.
  • Zwift Hub: For Zwift Hubs that are updated to firmware 5.2 or newer, fixed an issue which could cause the spanner/wrench (i.e. calibration) icon to briefly appear on the Pairing screen after pairing the Hub. Manual calibration is no longer applicable because Auto Calibration is in effect.
  • Fixed missing shadows from some trees on Alpe du Zwift.
  • Workout Editor: Fixed an issue that could cause the numbers on the duration timeline to flicker.
  • Ride leader fences will now be enabled by default.
  • Fixed a visual issue that could affect the nameplates of Zwifters behind you.

Android:

  • Fixed a potential crash that could occur when opening the Settings screen.
  • Fixed a potential crash that could occur when exiting Zwift.
  • Fixed an issue that could cause the game to momentarily dim after hitting a boost strip on Repack Rush.

Discuss this release on Zwift’s forum >

Questions or Comments?

If you spotted any other changes or bugs in the update, please comment below!

Top 5 Zwift Videos: Watopia’s Southern Coast – The Community’s Perspective

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Zwifters rejoice! Zwift has recently released the first expansion to Watopia in 3 years! With game version 1.51, riders can now access the new southern coast of Watopia, an expansion that takes riders from the Fuego Flats desert to the Mayan Jungle. Watch these videos to see what the community has to say about the new expansion.

Watopia Southern Coast Road Expansion: New Zwift Roads

Shane Miller, GPLama gives Zwifters the full rundown on the new expansion. He provides details on the courses, sprint segments, and some other easter eggs that Zwift has included.

How tough can it be?! New routes added to Zwift!

After receiving the new update, Katie Kookaburra hops on Zwift to check out the new routes. Watch as she talks about the new expansion and explores the new roads.

New Zwift Coastal Roads in Watopia

Tariq Ali from Smart Bike Trainers talks through the different parts of the new expansion as he rides through the new roads. Additionally, he provides details about the new routes.

New Zwift Watopia Expansion! 8 New Routes and 19km of New Roads

If you’re looking for some quick and concise information about these new roads, tune into DesFit’s 4-minute video. This covers route details, sprint details, and more!

Big Zwift update! First Ride On 19km Of New Roads In Watopia

Road.cc rides the new roads and talks through each of the different sections of the expansion. Details on routes, potential future expansions, and some easter eggs are also included in this video.

Got a Great Zwift Video?

Share the link below and we may feature it in an upcoming post!

What are these new buttons on Zwift’s action bar?

What are these new buttons on Zwift’s action bar?

The most recent Zwift update added two buttons to the action bar:

What do they do exactly? Zwift’s release notes don’t mention them, so I decided to do a little testing…

Getting Them To Show Up

First things first: chances are you aren’t even seeing these buttons in your action bar. The action bar’s options change based on what you’re doing in Zwift, and these new buttons only show up (as far as I can tell) in one very specific scenario.

First, you have to have a smart trainer paired as “controllable”. Next, you must be in workout mode. Lastly, you have to have Erg mode turned off.

So these only show up for smart trainer users who are doing a workout with Erg mode turned off. But what do they do?

Resistance Changer

The buttons show a smart trainer with a + or – sign next to it. Mouse over them and the + says “Harder” while the – says “Easier”. Click the + button and your trainer resistance will increase. Click the – button and it will decrease. You’ll even see a little vertical resistance meter moving up and down to the right of the main center HUD element:

See resistance gauge to right of center HUD

So these are trainer resistance adjusters. Interesting. But why has Zwift added this option to the game? I have three theories…

Theory 1: A Niche Feature

It’s possible that the current scope and functionality of this feature is all that’s planned. If so, what problem is Zwift trying to solve?

It would be a very niche issue: if someone was doing a workout on a low-geared bike (such as a MTB or city bike) and preferred doing workouts with ERG turned off, this feature would be helpful.

In this scenario, the workout may ask you to put out a higher number of watts (say, 450W) but you may not have a high enough gear to give you the resistance needed to hit those power numbers. Bumping up your trainer’s base resistance level would basically make your bike feel like it has higher gears.

Theory 2: An Unannounced Beta Test

Perhaps this is a new feature Zwift plans to roll out to the action bar in all scenarios, but they wanted to test the feature with a more limited audience. Having it only show up when Erg mode is off would let riders “in the know” test the feel and functionality of the resistance changes before a larger releases.

Theory 3: A Mistake

Lastly, there is the possibility that these buttons are still under development and weren’t supposed to be included in the public release.

Potentially Useful

Easier is good

My hunch is that theory 2 or 3 are correct, and Zwift plans to roll this feature out to the action bar in more scenarios. At least, I hope that’s the case.

Why would Zwift release such a feature? Because it lets you dial in your mechanical gearing for a better experience. Depending on how your bike is geared you might spin out on hard sprints or descents (gearing is too low overall) or you might grind to a halt on steep climbs (gearing is too high overall). This has always been a problem for people who ride mountain bikes on Zwift (real ones, not virtual ones), and while virtual shifting solves the problem, it only solves the problem for people who own a Zwift Hub trainer with a Click or Play controllers for shifting.

Adding these resistance-changing buttons to the action bar in (almost) all ride scenarios would let all smart trainer users dial in their gearing nicely. The only time it wouldn’t make sense to show the option would be while doing a workout in Erg mode, since the game is setting the proper resistance automatically.

It’s worth noting that Zwift is saving the resistance setting between sessions, too. This indicates that Zwift sees this as a way to dial in your trainer not just for specific times on specific workouts, but for your training overall. So I’m hopeful that this feature will be available in more scenarios soon.

Questions or Comments?

That’s my take on Zwift’s unannounced action bar addition. But what’s yours? Share below!


Zwift Ride Series “World Tour” Events Announced

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Zwift Ride Series “World Tour” Events Announced

After a break during October, the Zwift Ride Series is back for November with a “World Tour” theme featuring three top pro cycling teams: Movistar, INEOS Grenadiers, and Jayco AlUla.

Each team is hosting a stage, including special events featuring pro riders. Get all the details below…

Route and Schedule Details

Rides are 60 minutes long and scheduled hourly at five minutes past the hour.

See all upcoming ZRS events >

Special Guest Rides!

Want to spin with the pros?

Each stage includes special events hosted by pro riders from the featured team. For a list of upcoming special guest rides in this series, visit this custom ZwiftHacks link.

Signing Up

To sign up for the series, click the card at the top of the homescreen and click “Register”. You’re all done! Clicking the card will now show your progress as you complete each stage.

Next you’ll need to join and complete at least one ride from each of the three stage. They’re scheduled hourly, so you should be able to fit one into your schedule.

Badge Unlocks

Complete all three stages this month to unlock the Zwift Ride Series: World Tour badge!

Questions or Comments?

Share below!


Notable Zwift Events for the Weekend of November 4-5

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Yep, it’s that time again. For most in Northern America, Daylight Savings Time is going away this weekend. This means that we are another step closer to peak indoor cycling season!

This weekend, we’ve selected a few endurance rides, two races series, and a beginner-friendly Alpe ascent.


🤝 SZR Endurance Ride

✅ Popular Event  ✅ Beginner Friendly

Join SZR for an endurance ride on one of the all-new courses in Watopia! Get familiar with the new roads as you ride ~2 laps of this new big loop around Watopia. This is meant to be a social ride, and sticking together as a nice large group helps to make the ride more fun for everyone! Three different pace groups will be offered on this ride: C, D, and E.

Riders will be riding on The Big Ring, a course that includes Watopia’s recently-added Southern Coast expansion.

Saturday, November 4th @ 7am UTC
Sign up at zwift.com/events/view/3898793


🥇 Rund um den Kirchturm 2023/2024

✅ Popular Event  ✅ Highly Competitive

The Rund um den Kirchturm race series is back for the 2023-24 indoor cycling season! Last season this series was one of the most competitive and great fun for those looking for a highly challenging series. The organizers have taken feedback from last season’s riders and utilized it to improve this series to make it their best yet.

These races are a bit longer than the typical race, with this race taking place over 6 laps of the Richmond Rollercoaster course.

Special locations: category-enforced, power meter required, heart rate monitor required

Saturday, November 4th @ 10am UTC/6am EDT
Sign up at zwift.com/events/view/3858846


🥇 November Rain ’23 by PETA-Z & MoC

✅ Popular Event  ✅ Endurance Ride  ✅ Fresh Series

PETA-Z’s November series is an endurance event series that pushes riders to their limit. Riders are allowed to race or simply ride the event (the event is set up as a race, so it will register as a race in Zwift Power, ZwiftRacing.app, etc). Throughout November, riders will be able to participate in this event weekly with new courses each week.

This weekend, riders will be riding 5-6 laps (depending on the category) on the Tick Tock course in Watopia.

Special settings: Category enforced, heart rate monitor required, power meter required

Sunday, November 4th @ 8:15am UTC/4:15am EDT
Sign up at zwift.com/events/view/3898822


🤝 BMTR Flat 100 (Miles)

✅ Popular Event  ✅ Endurance Ride  ✅ Legacy Leaders

Start the weekend off strong with an imperial century around the roads of Watopia. This is likely one of the most popular century rides on Zwift, and BMTR has a great reputation for their fun and well-organized rides. 

There will be three different pace categories in this ride. Categories C and D will be stopping for a rest break 100 km into the ride. The ride will be taking place over 100 miles on the Watopia’s Waistband course.

Saturday, November 4th @ 12:10pm UTC/8:10am EDT/5:10am PDT
Sign up at zwift.com/events/view/3898909


🤝 Seattle Baby Steps 1.0-1.3 w/kg

✅ Beginner Friendly  ✅ Legacy Leaders  ✅ Popular Event

Seattle Baby Steps is well-known for their welcoming and beginner-friendly group rides. Join them for an epic ascent up the iconic Alpe Du Zwift! Many of the group rides up the Alpe can be a little quick for some, but Seattle Baby Steps is offering a much lower pace with the leader holding 1-1.3 w/kg.

The group ride will tackle the Road to Sky course, which is the most direct way to access the Alpe.

Sunday, November 5th @ 3:15pm UTC/10:15am EST/7:15 PST
Sign up at zwift.com/events/view/3901019

How We Make Our Picks

We choose each weekend’s Notable Events based on a variety of factors including:

  • Is the event unique/innovative in some way?
  • Are celebrities (pro riders, etc) attending/leading?
  • Are signup counts already high, meaning the event is extra-popular?
  • Does the ride include desirable unlocks or prizes?
  • Does the event appeal to ladies on Zwift? (We like to support this under-represented group!)
  • Is it for a good cause?
  • Is it just plain crazy (extra long races, world record attempts, etc)?
  • Is it a long-running, popular weekly event with a dedicated leader who deserves a shout out?

In the end, we want to call attention to events that are extra-special and therefore extra-appealing to Zwifters. If you think your event qualifies, comment below with a link/details and we may just include it in an upcoming post!

Your Thoughts

Got other events that stand out this weekend? Share below in the comments!

“Neokyo Nights” ZRacing November 2023 Series Details

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“Neokyo Nights” ZRacing November 2023 Series Details

Zwift’s “ZRacing” is the platform’s most popular ongoing race series, and in November it’s all about Neokyo, Makuri Islands‘ neon-infused permanight urban center. To keep with the neon theme, everyone gets to ride a Tron bike this month!

Read on for details about race routes, the overall monthly GC competition, and more.

Neokyo Nights – November’s Route Schedule

Here are the routes we’ll be racing in November (click route for more details).

  • Stage 1 (Nov 6-12): Sleepless City
    • 2 laps (19.2km, 84m elevation)
    • Powerups: Aero Boost, Draft Boost 🛈
  • Stage 2 (Nov 13-19): Twilight Harbor
    • 3 laps (20.8km, 102m elevation)
    • Powerups: Aero Boost, Draft Boost, Cloaking 🛈
  • Stage 3 (Nov 20-26): Railways and Rooftops
    • 2 laps (14.6km, 161m)
    • Powerups: Anvil, Draft Boost, Feather 🛈
  • Stage 4 (Nov 27-Dec 3): Sprinter’s Playground
    • 2 laps (24.9km, 134m)
    • Powerups: Draft Boost, Cloaking, Aero Boost 🛈

See upcoming Neokyo Nights events >

Tron Bikes for All

In keeping with the neon-themed look of Neokyo, event planners at Zwift have assigned the Tron bike to all racers this month. So even if you haven’t earned your Tron bike quite yet, you can take it for a test drive!

Curious how well the Tron bike performs? Check out our Tron Bike vs Top Performers chart >

Zwift Community Live(stream)

Nathan Guerra at Zwift Community Live is providing commentary and a live stream of each Monday’s 5pm UTC/1pm Eastern/10am Pacific race. Here’s the first race, and you can also click here for the playlist of upcoming ZRacing broadcasts.

Series Structure

The ZRacing series consists of monthly sets of weekly races. Each race is scheduled for seven days (beginning 1:10am UTC on Monday and running through to the next Sunday). Timeslots are consistent week to week and month to month.

Races are scheduled ~15 times each day, so there are plenty of available times to find a race.

See upcoming events at zwift.com/events/tag/zracingnov2023

Monthly GC on ZwiftPower

Each monthly series includes a time-based GC (general classification) tracking riders’ best finishing times for each week’s race. The overall winners in each category for the month are the riders with the lowest overall time for that month’s set of races.

See November’s GC on ZwiftPower >

With over 100 weekly timeslots available, riders can race each week’s event multiple times and try to better their finishing time. Tip: the fastest times usually come from the largest race fields!

You must use a heart rate monitor and be on a smart trainer, smart bike, or power meter to show up in ZwiftPower results for this series.

If you aren’t signed up for ZwiftPower, check out our post How to Sign Up for ZwiftPower (and Why Every Zwifter Should Do It).

Get the Badge

Each month’s ZRacing series has a unique achievement badge, which you can unlock by finishing every stage for the month.

There are no makeup events, so if you miss a stage, you miss out on the badge and competing in the GC.

One and Done

Zwift has planned these events to deliver a solid 1-hour workout, so each race should only take around 1 hour to complete, including your warmup and cooldown.

Questions or Comments?

Post below!