long-distance runs are also harmful; a person should run not too much and with breaks.
A person is an extremely resilient being. As a classic said, "as long as a person hasn't died, he's alive." It may not seem like a very smart phrase at first glance, but if you think about it...
Personally, I wouldn't mind joining the army if I had to. I'd go and serve. But imagine, I could then brag to my friends or, in the future, to my son, saying, "I've experienced the army."