As a senior in highschool I took creatine. I couldnt run as well As I could before. I was a state qualifier as a junior, and all conference, but then as a senior i was bumped to jv. I gained prolly 15 lbs, I didnt get fat either. I was the biggest damn cc runner in the state. I really think it had to do with the creatine. But when it came to track I ran the 400, 600, 800, and sometimes mile and did just fine. I think it hinders the endurance facter anywhere past 800 meters.