Having good separation between your upper and lower body facilitates greater speed and power in your golf swing. Limited separation can result in a number of swing faults including too much lateral movement (sway or slide) and loss of posture.
Hold onto a bench with both hands and get into a squat position.
Keeping your chest and shoulders square, lift your leg and turn your hip under your shoulders, twisting from the waist.
Return to the start position and repeat on opposite hip.
As you progress, try to sit your hip on the ground.
Do 8 to 10 repetitions.