<human>: Can you give me a shortened version of the text?

Some background on me: 

-22, male, 5'11, 185, very fit, kickboxer/fitness enthusiast, no history of knee pain

I started having some pain in my (99.9% sure) bicep femoris tendon a few weeks ago while doing a fairly intense sprint/jog interval workout. Since then, I've continued lifting weights occasionally, cycling, and other various forms of exercise, but running makes it really sore. From what I can tell, it's the impact involved with running that makes it hurt (squatting, lunges, etc. don't hurt at all). I feel a quick flair of pain right as I release tension in my leg muscles while running. The best way I can describe the pain is a sort of dull ache/throbbing pain.
<bot>: no pain while at rest, no pain at the start of the workout, no pain during tension, short burst of pain immediately after high tension is released, dull ache for about a half hour after workout is over