Sit-ups require optimal strength in nearly all of ... Trainer tips: Avoid using your hands to pull your head off the mat—rely on your core to do the work. Don’t allow the lower back to arch ...

I do about 15 pull-ups on the pull-up bar ... I think what you find is calisthenics, the old push-ups, sit-ups, 8-count bodybuilders, chase the rabbit, these were exercises that I still do ...