I am concerned that my form is off for the leg press. When you lower the weight, how low do you go. I find that I can't get my knees very bent before my hips and back start lifting and/or hurting. I usually stop lowering at this point and start the push up, but I am worried I am not going low enough. I did this yesterday and managed to get to 85kg (I am a novice remember!!!) and feel sore today, but could my form be a problem ie not lowering far enough?