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Forget sit-ups: This seated core workout fired up my abs and thighs like never before

You don’t need to get on the floor to challenge your core. A personal trainer’s seated workout is proving that effective ab ...

No, not planks or sit-ups — here's the one abs exercise you need for elite core strength and stability without weights

Hollow knee tucks are a bodyweight exercise that strengthens your core and hips without hurting your spine. Here's how to do them.