7. Bicycle
How to do it:
- Sit high (chest flat and shoulders down) in the front half of a chair.
- Grasp the sides slightly with your hands and lean back slightly, straining your abs, raise your right knee to chest height.
- Lower it, then lift your left knee on the next rep.
- Alternative. If you are good at it, try raising both knees at the same time.
Do up to 10 reps per leg.
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