No planks or sit-ups: This 5-minute Pilates routine targets your deep core to build strength and stability

Here are the four exercises to try.

Sit-ups vs. crunches—here’s which is better

Plus, which move is more effective for strong abs.
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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.