I've been doing leg press on a sled machine for about two months now and I'm thinking I've been progressing ok. I'm up to 430lbs right now. However, I'm not able to bring the sled completely down to where there's a 45 degree angle between my upper and lower leg without my heels coming off of the sled. My upper legs are almost touching my chest at just below 90 degrees. I also notice that if I try to go all the way to the 45 degree angle, I can't even push half of the weight. Am I losing something by not doing the extra 45 degrees of motion or should I just keep on doing what I was doing considering I progressed quite a bit in these two months? It seems like higher weights would put a lot of stress on my ankles if my heels are coming off the sled in that last 45 degrees. Here's an example of what the exercise I'm doing and the machine it's on http://www.exrx.net/WeightExercises/Quadriceps/SL45LegPress.html Wanna kill these ads? We can help!