Feel your left pec go up and back like the Hulk
Rather than the lead (left) shoulder going straight up from the top, shift across a little at the top of the swing — your head moves a bit over in transition and then pulls back as the lead side extends. Feel the lead (left) pec working up, extending and back behind you. Hanson's image: you're the Incredible Hulk breaking through the chains and sticking your chest out.
Channel: CraigHansonGolf
Watch official source at 8:07