Somewhat unusual experience today. As I was walking the jetbridge, I saw in front the captain (4 bars) walking to the plane. He's of fairly advanced age (which is reasonable as he's likely a senior captain at UA), but also - the guy was quite obese and seemed to have a bit of trouble walking. He appeared to stop mid-jet bridge to catch his breath, as I walked very slowly behind him. He appeared somewhat winded as he entered the plane, talking to FAs. Was carrying a very large sandwich too (I'd say at least 2000 calories there - I count mine, so I am fairly good at estimates)

I realize flying is essentially a sedentary occupation, and probably not conducive to good physical health. Still, someone this large and with evident fitness issues probably is not in the greatest cardiac health. How does that work with potential stress of handling difficult situations under pressure?

Just to be sure - I am not posting this to complain or single out this person. I am more interested whether there are any general requirements for fitness and such for pilots, and how do they work in cases like these (and because I've never seen something like that before, just curious)