Obviously, any activity is a chance to hurt yourself. And any regular activity is a chance for overuse injuries. I keep having small injuries here and there. T

Obviously, any activity is a chance to hurt yourself. And any regular activity is a chance for overuse injuries. I keep having small injuries here and there. The difference is that I am currently running 70km a week on average (7-10km on most week days, 10-21.1km on Sundays). My leg muscles are hard as rocks and my Achilles tendons are twice as tough as before (based on the increased cross section based on the images I have). It is much harder to evaluate load capacity of my knees (I don't have images to compare) but it is easy to see If I just started running 10k every day (even if I was able to do it aerobically) I would probably blow my knees in less than a month. Additionally, I suffer from torn ACL and before I started running my knee was kinda lose which made even walking a bit difficult (constant popping sounds, pains, etc.) Thanks to running and strength training the stronger muscles and other tendons took the slack off my knee and I pretty much forgot that there is anything wrong with it. I just need to pay attention to not get carried off too much and start doing some stupid shit like playing soccer or basketball which would definitely be a bad idea. As long as my activity has controlled moves like running or hiking in not too difficult terrain, I am fine.