Hell, I'm 23 and have had knee surgery(jumping out the back of a Bradley) and my back gets stiff some times(UH-60 had to make a hard landing in the Sandbox) and I still go jogging every morning, and nearly maxed out my last PT test.
Running away is a good skill to have for a foot soldier.
NRA Life Member
Me: "The .45 GAP was an answer to the question nobody asked."
Trooper pal: "Says the guy who thinks .38 Super and 10mm are viable pistol calibers and gets mad when Wal-Mart doesn't have them."