VO2 Max: What It Is and How to Improve It

Understand what is being measured

VO2 max describes the maximum rate at which the body can use oxygen during intense exercise. A laboratory assessment and a wearable’s estimate are different kinds of information. A watch estimate can help you follow a trend, but it is not a laboratory result or a personal prediction of lifespan.

Begin with repeatable activity

Choose an aerobic activity that fits your current ability and schedule. Record its duration, how demanding it felt and whether you recovered comfortably. If you are starting from little activity, build gradually rather than copying an advanced interval protocol from a social-media post. Consistency gives you a more useful starting point for later decisions.

Compare like with like

When reviewing sessions, note hills, temperature, equipment and other circumstances that change effort. A faster pace on a cooler day may not mean the entire training plan suddenly improved. Look at repeated observations and how everyday activity feels, alongside any wearable trend.

Introduce demanding sessions thoughtfully

High-intensity intervals are not a required starting point for everyone. A qualified coach can help decide whether they belong in your program, and a health professional can advise when health concerns affect exercise. In Fortiva, use workout history and recovery context to review suggested sessions. Keep the plan adjustable: a missed workout is a scheduling problem to solve, not a reason to stack several hard sessions together.

Tools and further reading

Explore the related Fortiva coaching tools to organize your own plan.

US Physical Activity Guidelines: questions and answers. This guide offers general educational information and has not been presented as a clinical assessment.