This is about as similar to my injury as I've seen so far. I'm 16 and I recently was playing football(soccer) and I wasn't going through any pain over the course of the match but about half an hour after I came home, had a bath etc I found this pain in my inner upper thigh just below the groin. I didn't think too much of it at the time I just thought some rest would help but now I'm feeling pain when I try and stretch it. If I lay it flat for too long it hurts when I try and bend it and if I leave it bent for too long it hurts when I try and stretch it. I don't really know how to describe the pain but at a guess and it will probably not be this due to my lack of knowledge in this field but I would take a stab at muscular. Can anyone help me out with any exercises to treat this? If not any help recognising what the actual injury is? Thanks