core
Reverse crunch
Lower-ab curl.
▶ Watch the full demo in the app3-second preview. The full demo with coach cues is in the FirstGym app.
How to do it
- Lie on your back, knees bent over your hips.
- Curl your knees toward your chest, lifting your hips.
- Lower with control.
Beginner tips
- Curl the hips up, don't just rock.
- Keep it slow.
- Don't use momentum.
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