How many crunches you should be able to do at every age — use the ‘football field’ test for motivation
Crunches are great for strengthening and toning your core muscles, specifically the rectus abdominis (AKA your six-pack) and ...
Crunches can help you get abs – but they do more than that.
No matter which variations you follow, crunches have the advantage over sit-ups of being able to better target abdominal muscles. "Because the movement is smaller, you can control momentum more," ...