The most fit sub-populations in the US are by order of fitness:
Tend to do nothing except work out with weights in order to avoid getting raped. Wardens like how this keeps them too tired to make trouble  . One wonders why enforce victimless drug laws when the end result is that the bad guys just get stronger?
They are physically active at various levels of intensity for 7 or more hours per day. 
- Active duty marines
Exercise 4 hours a day some of which is voluntary. 
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