With the Myworkout app, you can measure your VO₂max with scientific accuracy, using only your smartphone.
When you exercise with the app, it estimates your biological age and your VO₂max based on how far you've run, and at what speed and incline you've had during an interval. This measurement then calibrates the app — allowing it to understand your individual capacity.
From there, the app knows when you’re exercising in the right intensity zone (High-Intensity Training) — the zone where real health improvement happens — even when you’re doing other kinds of exercise. Decades of international research have confirmed that exercising in this range is the most effective way to improve heart function, endurance, and overall health.
When you stay in that zone, the time you spend there is tracked as HIT minutes (High-Intensity Training minutes). Accumulate 32 HIT minutes per week, and you’re actively building capacity — your capacity increases and your biological age decreases. Keep it up, and you’ll build a streak that turns your progress into motivation — gamifying your health journey one week at a time.
The app calculates VO2max and biological age by assessing how much work you are able to perform during a standard 4x4-minute high-intensity interval session. It's done differently outdoors, on the mill and at the machine.
No special equipment is needed to get started with and enjoy MyWorkout. All you need is a smartphone. Our cutting-edge technology measures your capacity with scientific accuracy, even more accurately than wearables.
However, if you already use wearables, you can integrate them with our app. You can find instructions for integrating third parties here.
For some people, it's fun and motivating to use a heart rate monitor when exercising, for others it's not. With Myworkout GO, you can choose whether you want to use your heart rate as a guide or not. It also works perfectly well without a heart rate monitor. Without heart rate monitoring, you use your own breathing to control the intensity. During the intervals, you should breathe heavily without feeling any discomfort.
To benefit from a heart rate monitor, you need to know your maximum heart rate. If you don't know what your maximum heart rate is, you won't get any benefit from using a heart rate monitor. Remember that there is no shortcut to finding your maximum heart rate. The methods used to calculate your maximum heart rate are very inaccurate, as there are large individual differences in maximum heart rate.
Unlike direct VO₂max measurement with a mask — where your total oxygen uptake is measured and then divided by body weight to get VO₂max in milliliters per kilogram — the app measures the work you’re able to perform during a standardized test. From that, it directly calculates VO₂max in milliliters per kilogram of body weight.
Because walking or running naturally involves carrying your own body weight, that load is already accounted for in the calculation.
When training on equipment that measures power output (watts), you’ll need to enter your weight to calculate VO₂max accurately.
By using our method, you trade a small amount of accuracy — about 93% compared to 97% with direct mask measurement — for accessibility and convenience. It allows you to test yourself with an acceptable margin of error, without the need for specialized medical equipment.
Myworkout 4x4 is our app for personal use — designed for anyone who wants a simple, guided way to improve health and fitness with just 16 minutes of training, twice a week. It’s built around the same science and technology used in clinical research but tailored for an individual journey that’s clear, motivating, and easy to follow.
Myworkout GO is for organizations — companies, insurance providers, gyms, and clinics — that want to make health measurable and engaging on a larger scale. It includes the same scientifically proven 4x4 training and VO₂max measurement tools, but adds features for teams, campaigns, and corporate wellness programs.
Both apps are built on the same scientifically validated exercise methodology and underlying technology, with distinct use cases for individual and organizational users.
If your company or organization uses Myworkout GO for Business, you can still enjoy the Myworkout 4x4 experience for your own personal training — your data and progress stay synced across both.
If you’re an individual looking to take control of your health, start with Myworkout 4x4.
If you represent a business, insurer, gym, or clinic and want to make Myworkout part of your health offering, schedule a meeting with us to learn more about Myworkout GO for Business.
