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 ...
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Toe taps on a ball: The low-impact core move fitness experts swear by for a stronger midsection

This simple yet powerful stability exercise activates deep core muscles, protects your spine, and builds real functional strength without crunches.
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Stop cranking your neck: The 10-minute standing routine that blasts your abs without a single sit-up

Forget the floor—this high-efficiency standing workout uses light resistance to target your upper abs, lower abs, and obliques in a fraction of the usual time.