If you are looking to generate more power in your golf swing, you need to be able to move your hips through full range of motion. You also need to have good strength in your hamstrings, quadricep muscles and core. This exercise hits all those areas.

Stand in a modified golf stance using a club for balance.
Lunge your right leg behind your front leg as you step to the side.
Squat down and stretch your extended leg out to the side. Hold position for a moment.
Return to the start position and repeat on opposite leg.
Do 8 to 10 repetitions on both legs.