Get in Your Cardio and Strength Training With This Sweaty 30-Minute CrossFit Workout

• 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 the 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 12 box jumps.

If this is too difficult, do step-ups holding light dumbbells instead.