The Athlete mode is designed for people who are muscular. The algorithm for athlete mode is different from regular mode, because the characteristics of the body mass for athletes are different. One person can only fit one mode.
If you are an athlete or a muscular person, you need to select the Athlete mode in your profile. To change to the “Athlete Mode”, please go to “My Account”, tap on your name on the top, and switch on the “Athlete mode”, then tap on the “Confirm” button at the bottom to confirm your change.