I think Donna summed it up pretty well. Leaner Legs is definitely more endurance while PS is more for "strength". Leaner Legs will give you strength, too. They are both tough workouts. Leaner legs doesn't give you any break between exercises. You move straight from one to the next. PS gives you plenty of breaks and opportunties to go very heavy on your weights, and, as mentioned, a pretty good amount of floor-work. On a more personal note, I enjoy Leaner Legs a little more. It is a blast for me, and even though I'm working sooo hard, I am truly enjoying it the whole time. Both have very good ab work at the end.