Challenge completed - 100 reps:
Core madness
- 2x1 minute regular plank (24)
- 2x1 minute backward plank (24)
- 2x1 minute right side plank (24)
- 2x1 minute left side plank (24)
- 4x knee-pullups (4)
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Challenge completed - 100 reps:
Core madness
Whoa - lots of planks. That's great. This is what your muscles look like while doing the planks.
Nice illustration. Interesting.