VirtuSlo 4Endurance Zwift League
Join the Ultimate Zwift Challenge
Six weeks of epic racing with riders from around the world. Prepare for intense battles, compete for prizes, and enjoy the ride!
Join the League in Just a Few Steps
1. Create Your Zwift Account
If you’re not already on Zwift, it’s time to join! Head over to Zwift, create your account, and set up your virtual rider.
2. Register on ZwiftPower
For race results and rankings, make sure to create a ZwiftPower account. This is where all the magic happens with tracking performance.
3. Sign Up for the League
Once you're set up, sign up for the league and secure your spot in the action. It’s as simple as that!
4. Race Every Sunday
Get ready to race every Sunday between 11 January and 15 February. Compete for weekly prizes and aim for an overall reward at the end!
Race for Prizes Every Week
Weekly Category Winners
Every week, the top rider in each category wins a practical prize.
Weekly Lucky Draw
Not just the fastest — 4 lucky participants each week will also receive a practical prize, no matter where they finish.
What People Say About Our League
Benji Naesen
Cycling YouTuberThe VirtuSlo 4Endurance Zwift League is the perfect way to keep active during the winter period in a competitive way. It’s well-organised, for cyclists of any level, and you get to meet many cyclists from all-over the world with a similar passion for cycling.
Jasper Paridanes
Zwift Academy 2022 FinalistThe VirtuSlo 4Endurance Zwift League is a fun experience that I definitely enjoy. The courses and distance are well chosen, and it is always a challenge to perform well. A complete league like this is exceptional in Zwift.
Nejc Pogačnik
European 24h Team Time Trial ChampionAfter two successful seasons, I put the bike on the back burner for family reasons. The VirtuSlo 4Endurance Zwift League allows me to get back to training. I'm excited to be able to combine getting back in shape with racing and having fun.
Race Calendar - Longer Races
Stage 1
11 January 2026
Big Flat 8
Stage 2
18 January 2026
Royal Pump Room 8
Stage 3
25 January 2026
Achterbahn
Stage 4
1 February 2026
Greatest London Flat
Stage 5
8 February 2026
Double Parked
Stage 6
15 February 2026
WBR Climbing Series
Race Calendar - Shorter Races
Stage 1
11 January 2026
Big Flat 8
Stage 2
18 January 2026
Double Loop
Stage 3
25 January 2026
2018 UCI Worlds Course Short Lap
Stage 4
1 February 2026
London Calling
Stage 5
8 February 2026
Watt The Limits
Stage 6
15 February 2026
Climbers Gambit
Frequently Asked Questions
Participation is completely free. All you need to do is sign up for the league using the form above and create an account on Zwift and Zwift Power.
You need a bike, a trainer, a heart rate monitor, a device to run Zwift on (computer, tablet, phone...), and the Zwift app.
In addition, it is advisable to have the appropriate cycling kit (jersey, shorts, shoes), a towel, and a fan.
Don't forget about proper nutrition — energy gels or bars, sports drink, and recovery drink.
Yes, all participants must use a heart rate monitor, otherwise, the result will not be recognized.
Yes, you have to register for each race you want to take part in via the Zwift app. Signing up for a league only ensures you get points in the overall standings and are eligible for prizes.
We'll email you each week reminding you to register for the race.
You can skip one race without any consequences, as the best 5 results out of 6 races count towards the overall standings. The worst result will be deleted after week 3.
Categories are determined as follows:
Longer races
Category / zFTP W/kg / zMAP W/kg
A / > 4.4 W/kg / > 5.2 W/kg
B / < 4.4 W/kg / < 5.2 W/kg
C / < 4.0 W/kg / < 4.7 W/kg
D / < 3.7 W/kg / < 4.35 W/kg
Shorter races
Category / zFTP W/kg / zMAP W/kg / Overall score (5 min W/kg * 5 min Watts)
B / < 3.4 W/kg / < 4.0 W/kg / < 1450
C / < 3.1 W/kg / < 3.65 W/kg / < 1200
D / < 2.8 W/kg / < 3.3 W/kg / < 1000
E / < 2.5 W/kg / < 2.9 W/kg / < 800
Yes, it is possible to move up or down a category during the league. However, the general classification is based on the highest category in which you have competed in any of the races during the league.
No. You race the entire league either on longer races or on shorter races. If you switch race formats during the league, you will be moved to Category D.
All race results will be tracked on the Zwift Power website. The overall league standings will be published on the VirtuSlo website.
Detailed league rules can be found on the VirtuSlo website.
Instructions on how to find your Zwift ID are available here.