Okay so is not news that being in the military can be very rough on the body. This is a two part question. Often times I have certain muscles/tendons that pop. Yes I really mean they literally pop. Usually with little pain of anything of that nature. I stretch a lot more than most people, yet still seem to have more problems than most. Usually I this happens to my hamstrings, but lately it happens in other places around the knee and calf area. What causes this? Second I've been having a lot of knee pain. In the infantry when on patrols you will often times take a knee and stay that way for anywhere from a few minutes up to an hour. All of this with anywhere from 35-80lbs on your back. Needless to say getting up sucks. Stabilizing that kind of weight for long periods of time is plain awful. Especially if your knees aren't that great in the first place. So my question is what kind of activities can I do to counter this?