I'm not sure if this is sarcasm or not, but I'll go out on a limb and say that those athletes are far, far more healthy than the people slumping over their keyboards in an office all day (which is probably 90% of this message board).
For example, bodybuilding is known to be relatively safe and healthy in terms of training injuries and average-case benefits of training, but top bodybuilders - and even marginal amateurs - are not healthy, they are pushing their body way out of balance for pageantry; just listen to this guy [0] go on for thirty minutes about his pre-contest drug program. Likewise, basketball optimizes for tall people who can move fast, but basketball injuries are an everyday event, because tall people who move fast overstress their joints and ligaments.
Where athletes are healthy, it's because health and performance happen to align together. There are plenty of people here who want to optimize their mental abilities, and will go to the same extremes as any athlete. Paul Erdős was known for running amphetamines[1] to aid his ability to concentrate. Today you hear about folks using prescription pharmaceuticals for the same reasons.
[0] https://www.youtube.com/watch?v=lF4zL_BdePc [1] https://en.wikipedia.org/wiki/Paul_Erd%C5%91s#Personality