> Running slowly for 10 minutes a few times ... isn't going to hurt anybody.

Heh, don't get old or be born with the wrong genes. I have to start at no more than about 2min at a time being middle aged now. Some of us are born weaker and more fragile. Aging only makes this worse.

Strength training can help, though I've accumulated enough stubborn injuries now that I'm just thankful I can do anything.