- Stand with your feet slightly wider than hips-width distance apart in front of a sturdy box that's six to 24 (or more!) inches tall.
- Bend your knees and swing your arms back.
- Jump onto the top of the box with both feet, swinging your arms forward to give you a little momentum.
- Step one foot at a time back to the floor, or jump down softly with both feet.
- This counts as one rep.
- Do as many box jumps as you can for 40 seconds, followed by a 20-second rest.