I feel so horrible for people who get things like exhaustion. I know that there are people who can stand for hours on end, but there are a lot of people who LOOK physically fine and cannot walk across a parkinglot or an airport. Disabilities don't care how old you are or if you "look" disabled.

All people are not liars who are trying to get one over on you. I would rather be nice and trust someone if they say they have limitations.