Stand in a golf-address position with feet slightly more than shoulder-width apart, weight on the inside of each heel. Use both hands to hold a 5-pound medicine ball or dumbbell at center of chest, with elbows extended out to sides. Keeping head still and feet flat, bring the ball up and to the left, as in a backswing, until right shoulder is underneath chin. Return to starting position and repeat to the right.
Benefit: This exercise helps increase the range of motion of the trunk and shoulders, and helps you generate power in the trunk through impact. "This will improve range of motion in the upper body, which equates to power and consistency," says Roberts.