For example, people who run excessively tend to lose fast-twitch/bulk muscle mass and wear their hips, knees and ankles faster than most people. Pay for the ex

For example, people who run excessively tend to lose fast-twitch/bulk muscle mass and wear their hips, knees and ankles faster than most people. Pay for the exam, I'll debunk this one right away. And I believe the whole, "Running is bad for your knees" argument has been debunked, https://omrf.org/2016/09/12/is-running-bad-for-your-knees-surprisingly-science-says-no/ https://omrf.org/2016/09/12/is-running-bad-for-your-knees-su... For example, one of the worst things you could do to your body would be to repeatedly run fast, downhill while letting your feet slap the ground. I think falling off a cliff repeatedly would be a slight bit worse. Or taking up a meth hobby. Or other things that seems fairly obvious. I do a lot of trail running on steep trails (or no trails!) My knees are fine. As mentioned, lots of worse things to do to your body. Here's another one: take up skiing.