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20 Rounds of: 30s Work : 20s Rest 1. Jumping Jacks (count hands overhead) 2. Shoulder Taps (count each tap) 3. Arch Ups 4. Russian Twists (count each twist) Stay with the same movement until you accumulate 100 repetitions, then proceed to the next movement and repeat. If you finish all four movements with the 16 Rounds re-start from the beginning.