The Reason why you get knee pain and how to prevent it?

What is the Patellofemoral pain or knee pain? Do you remember that sharp pain when you are running? Or moments when you cannot make one more step on stairs? That is Patellofemoral or pain behind or around the patella (kneecap), which is usually aggravated by activities that load the patellofemoral joint. Those activities are running, squatting, going up and down the stairs, …