Most of your body's muscle mass is located below the belt, so why stand still while working your arms? Double your burn with this two-part sculpting move!
How to do it: Grab a pair of dumbbells and stand with your feet hip-width apart, elbows bent, palms facing in. Lower into a squat, and bring your chest slightly forward, hinging from the hips, while arms press back behind your body into a triceps extension.
Raise your torso back up, and step your left back, turning your body to the side, while performing a biceps curl [as shown]. Step your left foot back to start and repeat the squat and triceps extension, stepping and turning to the right this time. Continue alternating sides for 1 minute.
Form tip: Brace your abs in tight to support the spine, and avoid rounding your back—maintain a natural arch during the entire movement.