Box Jumps 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. Image Source: Getty / EmirMemedovskiProduct Credit: Outdoor Voices sports bra, H&M pants, APL sneakers