What Muscles Do Sit-Ups and Crunches Work?. Nike UK

Ab exercises like crunches and sit-ups target similar muscles. Learn more about abdominal anatomy and ways you can target different muscles.

I just tried JLo's ab workout for a week — here's what happened

The Quick Ab Workout Trainers Love. Nike UK

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Nike trainer insists sit-ups every day WON'T give you abs