LEG PRESS
How it's done?
Set up the leg press machine for your settings, first try to do without any weights and when you feel like it you can add weights. First lift the press up and have your knees go straight, from there start descend the press by bending your knees. Don't let your lower back rise from the bench! When your knees are almost touching your chest or are at the point you don't feel comfortable to lower any more, start straighten your knees again. You have done one repetition. Important thing is, you do not lift the weight with your "knees" but with the muscle on your feet! I don't recommend that in the upper position you fully extent your knee, because this wears your knees when you do it with bigger weights.
What it targets
Leg press targets your quadriceps, a little hamstrings and gluteus maximus.
Tips for shaping butt
For targeting more on the butt you can move your feet up on the sled plate. Because you are using big muscles they tend to grow and get stronger quite fast, so you should not be afraid of adding more weight when you start to feel too easy on the machine.