Medic!!!! Man down, man.....errr no wait bird down!! One for you online medical guru types... The last 4 months my training has increased for competition, everything has been going ok up until last week. Whilst doing a session on the tredmill i felt a burning sensation on the back of my left knee, it felt like someone was holding a lighter to it. You have those two tendon thingys behind your knee and its the inner one of those, it knacks. Its not enough to make me stop but its uncomfortable and i've convinced myself it's going to snap, hurtling my knee somewhere, and i dont have a spare one!! It's happening on each run now and afterwards it's quite tender. What is it? Whats causing it? How can any make it stop? Will i die from it? Any advice (relevant) would be much appreciated. Cheers.