Extra Work - Engine

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For Time

541
For Time:
100-80-60-40-20
Double Unders
50-40-30-20-10
Hollow Rocks
Complete 1 Shuttle Run after each round.

- Shuttle Run = 10 meters out and back, 20 meters out and back, 30 meters out and back, 40 meters out and back.
- Reduce the reps in 1/2 or perform single unders to scale. Cap this workout at 20:00.