Step by step instructions
Stand with your left foot on a step (or on the floor), knee bent, and right foot a stride's length behind it. Hold a heavy dumbbell in each hand, bend forward from your hips, and extend arms down, palms facing each other.
Bend your elbows back, drawing weights to your sides as you raise your torso. Return to starting position and repeat; switch legs halfway through set. To help activate your back muscles, squeeze your shoulder blades together as you bend your elbows.