You'll be generating power through a gradual buildup of club head speed. At address, imagine that your legs are two coiled springs ready to contribute to the power in your swing. Address the ball with a good knee flex and even bounce a little bit as you prepare for the shot. Envision your weight shifting onto your right leg as you swing back. A WIDE ARC Visualize the left arm and club shaft as a single unit Swing back slowly and smoothly.
Most straight hitters get power only from the upper body.
To get your lower body into it, see your first move down as a lateral shift of your knees directly at the target. Your weight moves immediately onto your left side, pulling your hands and arms into the ball with increasing speed. This image will free you from any tendency to steer the clubhead. Steering causes you to hold back the release of the wrists and reduces your clubhead speed before Impact. To reach this balanced position, you'll swing the clubhead freely through impact, with no hint of steering.