Hey guys, new to the primal way of life. I am a college student that thought he was in good shape but haha clearly not that great! I try and live a mostly primal lifestyle...I do have the occassional dessert at the dining hall, but I limit myself a lot.
Anyhow, my real question is I just did my first sprint session today, I did a 10-20m jog before I went all out in all of my sprints, but on my fourth sprint I got this pain in the back of my left knee. Is this from not stretching or warming up enough? I finished that sprint and tried to do a 5th but I couldn't. When I tested it out jogging after, it didn't hurt, just when I went all out on the sprints. Help appreciated =)