Lindalva Wouter, I appreciate you worknig through this with me. The type of pain I feel mainly occurs when I am pulling my leg. It's not an excrutiating pain but more of a deep soreness that gets worse with use depending on how fast I am running. I definitely don't feel like I have to pull up hopping like you see sprinters do when they blow their hamstrings. If I lay off of running for about four days, it's almost gone. I rested it five days and then did the long slow five mile run Sunday and it started aching at 3.5 miles. Last night I tried to do the 100m sprints with a 20 lb. weight vest and it hurt bad at the third interval. Today it is a little sore mainly in the high hamstring area but not bad. I might could even run for a few miles if I did it slow. Speed definitely aggrevates it worse.