As a general guideline, we recommend Athlete mode for anyone who carries out more than 12 hours of intensive cardio-vascular and strength training exercise a week and who has a resting heartbeat of under 60bpm. (Some people naturally have a low heart rate – it does not apply unless they exercise at that level.) They should also have been exercising at this level for at least 6 months.
There is no exact moment when a person becomes an “athlete” and individuals vary. Some people will fall into a “grey” area between athlete and non-athlete; getting a slight underestimation on athlete mode and a slight overestimation on standard adult mode.
Athlete mode is particularly suitable for people in endurance sports like running and cycling and those in cross training. (Professional athletes and body builders may still get an overestimation of their body fat percentage even in Athlete mode.)