Grab a resistance band and step on it with one foot (use both feet for more resistance). (A) Hold the band in each hand at arm's length, about shoulder-width apart, and then bend at your hips and lower your torso until it's almost parallel to the floor. Your knees should be slightly bent and your lower back naturally arched. (B) Squeeze your shoulder blades together and pull the band up to your upper abs. Pause, then return the bar back to the starting position.