The hips are a major source of power in your golf swing. During the backswing your backside hip goes through three different planes of motion. If the bodies hip has adequate mobility the backside hip will flex in the sagittal plane, adduct in the frontal plane, and internally rotate in the transverse plane. The frontside hip conversely goes through hip extension, abduction in the frontal plane, and externally rotate in the transverse plane.
The video below utilizes the common and uncommon lunge from Dr. Gary Gray of the Gray Institute and tweaks in the golf swing to properly mobilizes the hips prior to hitting the course.