CRUNCHES TORSO AND LEG POSITION

164- CRUNCHES - TORSO AND LEG POSITION When performing crunches always keep your knees bent and feet flat on the floor. Performing any exercise with the legs locked out straight, particularly abdominal exercises, adds excessive pressure on the lower back. Also, raise the shoulders only 8 to 10 inches off the floor. Raising all the way up to your knees doesn't work your abs harder, it just brings the hip flexor muscles into play.