To develop Relative Effort, we started with the existing formula for Suffer Score and set out to transform it with input from sports-focused data scientist Dr. Marco Altini. Not only did we want to make it more precise for your runs and rides, but we wanted to make it compatible with all activities using heart-rate data, from a 30-minute interval session to a daylong excursion.
We pitted the work against thousands of activities to create a model that could be applied to different sport types, and we tested it across a wide variety of athletes to make sure it would be accurate no matter your fitness level.
Running, riding, swimming, skiing, indoor rowing – anything you upload while using a heart rate monitor will work with Relative Effort and tell you how tough your activity was on a leveled playing field. Check out how one workout stacks up to the last or how strenuous it was compared to a totally different sport. Or measure your next group workout with a more interesting question than who was fastest – who really gave it their all?