Tuck Jump Start in a squat position with your feet hip-width apart and arms down, making sure your knees are in line with your feet. Swing your arms up and jump into the air, bringing your knees up toward your chest so they go past your hips. Land, with your knees slightly bent, onto the balls of your feet for a quiet landing. Without pausing for the next rep, repeat the motion. Image Source: Tone It Up