Reverse Crunch.
Bodyweight lower-ab curl — hips lift instead of shoulders.
How to do it
- Lie down, hands at your sides, knees bent at 90°.
- Curl your hips off the floor, knees toward your chest.
- Lower the hips under control without arching.
Form cues
- Curl the hips, don't swing the legs
- Keep the lower back from arching between reps
- Slow on the way down
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