Athletes love data. We measure power, heart rate, lactate, VO2max, and whatever else our gadgets can throw at us. But often, getting proper performance testing means paying for expensive lab sessions or investing in subscription-based tools that lock insights behind a paywall.
That never sat well with me. So, as a small personal project, I spent a few days coding a free performance analyzer that anyone can use. No subscriptions, no hidden fees—just a straightforward tool that helps athletes understand their fitness levels using established physiological protocols.
How It Works
The analyzer is built around two test days, designed to measure VO2max, VLamax, and metabolic efficiency. These tests follow well-documented methods, providing meaningful insights without requiring a trip to a lab.
Test Day 1: The 30-Second Step Test
A classic incremental ramp test, where power increases by 25 watts every 30 seconds until exhaustion. This method effectively estimates VO2max, offering a solid picture of aerobic capacity. It’s efficient, straightforward, and works well.
Test Day 2: Time Trials & Sprint Test
On the second day, we refine the data with:
- A three-minute and six-minute time trial to improve VO2max accuracy.
- A short sprint test to assess glycolytic power and metabolic balance.
These results are then combined to give a well-rounded view of an athlete’s current performance level.
What You Get
The analyzer provides key performance metrics, including:
- VO2max – Your maximal oxygen uptake, a crucial endurance marker.
- VLamax – A measure of glycolytic (anaerobic) power, which influences endurance efficiency.
- Metabolic Profile – Insights into energy system utilization for better training decisions.
Easy Access: Free Files for Garmin, Zwift, and TrainingPeaks
To make the process as seamless as possible, I’ve created:
- Garmin files for structured execution.
- Zwift files for virtual testing.
- A free TrainingPeaks plan to guide you through each step.
For Runners, Too
Cyclists aren’t the only ones who like data. The same approach applies to running, with a tailored protocol for runners who want to measure their VO2max and metabolic efficiency—all available for free.
A Small Project, But Hopefully a Useful One
I built this because I enjoy projects like these, and because I believe that some things in sport should simply be free. Making a ton of money off athletes by putting basic physiological testing behind paywalls never really felt right to me. So, if this tool can help even a few athletes get useful insights without having to pay for yet another subscription, then it’s worth it.
Everything is available on the homepage, and I’m happy to answer any questions. Enjoy the testing, and may your VO2max be high and your VLamax precisely where you want it.