Get the lowdown on basic punches, gear, and shadowboxing.Read article
Stand in place with feet shoulder width apart, and jump onto a box with either a weighted vest or holding a dumbbell. Step back down to land softly and safely, but remember to focus on going as fast as you can while maintaining proper form.
15 jumps as fast as you can in 1 minute, for 10 minutes
The amount of time remaining after you completed 15 jumps in the one minute