Physically fit? Nah, not hardly.
Ya just gotta be able to see past the end of yer nose, have a ticker that ticks, and some form of serviceable appendages that add up to five (four if yer one'a them fixed wing driver types).
For us helicopter types it helps to be a hunchback and have one arm considerably longer than the other too.
I mean, come on. I'm a wreck and they let me fly!
(Thanks Happy!)
RTR