
jack burpee
Cardiovascular systemBody weight

Step 1: Stand with your feet shoulder-width apart.
Step 2: Jump off the ground and simultaneously cross your right leg in front of your left leg.
Step 3: As you land, quickly switch legs, crossing your left leg in front of your right leg.
Step 4: Continue alternating legs and jumping as quickly as possible.
Step 5: Repeat for the desired number of repetitions.