I ditched sit-ups for this standing ab exercise for a week — here's what happened to my core
Place your hands by your temples, with your elbows pointing out to the side. Lift your left knee, and at the same time, bend ...
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The major differences between sit-ups and crunches — and which one is best for you
The main difference between sit-ups and crunches is the range of motion involved in each exercise. Sit-ups require you to lift all the way up, while crunches require a slight lift off the ground.