10 FULL SIT-UP
Sit-ups look deceptively easy, but they can be quite challenging to do properly. If you can’t do a full sit-up on your own, have a partner hold down your feet while you perform all your reps. HOW TO DO IT: Start exactly as you would with a crunch, but this time, instead of only lifting halfway up, your goal is to raise from lying down to sitting up in one fluid motion. Don’t let your chin tuck into your chest, and only use the strength of your abs to pull you up to a seated position. Think of your torso as one straight plank from hips to head that raises and lowers like a lever.