Not sit-ups, planks, or crunches: I do this simple Pilates exercise every single day to build a strong and stable core and work on my hip flexor mobility

While exercises like sit-ups and crunches work the rectus abdominis, or "six-pack" muscles, this simple-looking exercise ...

‘Why I stopped doing sit-ups and started doing these 5 simple core exercises instead’

Want to run better? Stop doing sit-ups – here are five expert-recommended functional core movements to do instead.
T3

This simple core move builds strong abs and supports a healthy spine, according to a fitness expert

While everyone likes the look of a sculpted midriff, strong abs are also about supporting your spine, improving posture, and protecting your lower back. The key isn’t endless crunches, but ...

Can Crunches Really Help Target Belly Fat? Follow These Tips To Reduce Waist Size

Crunches strengthen abs but don't burn belly fat overall diet, cardio, and strength training do.