The reason I was asking was the other day I started lifting weights faster than usual, and I was sore for 2 days. I didn't feel it the day after but on the 2nd day I really felt it. Usually I lift slow (not too slow), try to get good form and never felt that sore. Do you think it's me getting tired quicker when I lift slow? So I stop quicker? Whereas if I go right in and lift fast then I feel adrenaline. If you lift to failure momentum shouldn't make a difference should it? If it's cheating, maybe your first 6-8 reps won't count, but since I feel pumped from the adrenaline I can get in another 8 reps or to failure. Whereas if I was to lift slow I would only be able to get in 8 reps. I'm wondering, since after trying it for the first time, I'd rather lift fast, the adrenaline keeps me from getting tired (In my mind when I'm counting reps., I feel like I'm trying to finish my set and it feels like it takes forever). If I lift fast, I feel like I just keep going until I can't anymore and want to get in as many possible. Although it would be easy for me to get injured like this, but I'm not lifting heavy weights. I can't lift heavy weights, my dumbell is 30 lbs., and I'm benching 40 lbs.