Do sit–ups lead to six-packs? A sit–up is actually the least effective abs exercise you can do. Doing 100 sit–ups a day will not change your body in the slightest.
By hooking your feet together during a situp, you can get a decent workout for your lower. Crunches build up the abdominal muscles over time, but can cause
Build a rock solid core and ripped abs with these alternatives.
See the new 90 second ab workout here @ https://www.youtube.com/watch?v