11
votes
2answers
435 views

Will squats/running/etc cause knee injury when we age?

I had been told that doing exercise like squats, running, jumping, etc will cause knee injury when we age. As we do those exercise we are rubbing the soft bone together and as time passes the soft ...
2
votes
1answer
482 views

What kind of muscle/joint/ligament do walking upstair/downstair involve?

I tried to understand why walking downstair hurts while walking upstair is good. All I found in the internet were website while keep saying the pointless fact "It's runner's knee" and didn't try hard ...