As I start my backswing, I visualise the clubhead on the outside rail of a set of railroad tracks and my hands above the inside rail. I trace a path along those tracks as long as I can, keeping my right arm straight. This creates a wide swing arc.
The wider the arc, the more power I can generate. I also try to keep my lower body stable, so I can create a nice, tight body coil. I don’t want my right knee and hip to drift away from the target; that ruins the coil. As a drill, I put the grip end of a club under my right foot (inset) and make backswings. It teaches me not to sway.