I started working out with a trainer a few months ago to loose weight( I currently am about 280), and noticed that when we would go walking I would hear a popping sound coming from my knee. As we continued and started to do some leg weights on a machine, there was pain. He told me it was just the weight and my age and to continue on. A few months have gone by now(I let the trainer go, I just felt that wasn’t right) but know I have some type of injury that I don’t understand. The back of my knee and the surrounding upper and lower areas hurt and stiffen. Ice makes it stiffen even more. If I sit too long it’s hard for me to stand up, and sometimes it feels as if there’s a band back there and on the side of my knee that tightens and twists for no reason(this hurts soooo badly). Please, anybody with any insight and/or suggestions, help me!!