The one P.E. class I've ever taken is Developmental Fitness. In that class, we pretty much did two activities: running and weight lifting. The weightlifting was fine, but here's an anecdote about the running: I once went for a long walk, about four miles, with no footwear. Near the end of it, my feet were quite sore, but I thought, "Hey, it's certainly better than running in Developmental Fitness." Turned out I had a huge blister on my foot. That was two weeks ago; the fluid is gone but the loose skin is still there.
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Contrary to my profile, I do know whether I have it or not. Tell me your guess.