Pro athletes, space scientists, and people like you :) HRV analysis dates back to the 1960s, when space scientists started using it to assess astronaut health and track how their bodies respond to rapid changes in surroundings.

This non-invasive method has since been picked up by pro athletes, who use it to monitor their recovery after tough workouts, avoid overtraining, and get ready for competitions.

For example, HRV-based gadgets help athletes like US Olympic Swimmers and pro football players hit peak performance.

Now you can use it to boost your performance too, and all you need it your phone!