So hypothetically let's say I am a domestic terrorist and I find out FBI agents can't do a pull up. How much you want to bet I am going to make it a priority that I can do pull ups? Then if they are chasing me all I have to do is take a path that requires them to do a pull up, say climbing a raised fire escape ladder, and I am home free.
There is a reason, other than boredom, that convicts in prison spend so much time working out.