- Start in a traditional plank — shoulders over hands and weight in your toes.
- With your core engaged, bring your right knee forward under your chest, with the toes just off the ground. Return to your basic plank. Switch legs, bringing the left knee forward. That completes two reps.
- Continuing doing mountain climbers for a total of 30 reps (15 each leg).
- Now it's time for squat jumps!