In the golf swing, you need to be able to do a combination of side flexion (frontal plane movement or side to side motion) and rotation (transverse plane or rotational movement) in your core to wind up behind the ball and create power. Most golf-fitness exercises only focus on the rotation aspect of the golf swing which leave out an entire plane of motion.
What is great about Pilates is that the exercises take your body through all planes of motion:
The sagital plane
The frontal plane
The transverse (horizontal) plane
I consulted with Pilates expert and 15 to Fit Pilates, Barre and Fitness owner in Mooresville, North Carolina, Patrea Aeschliman on what are the best Pilates exercises to work in different planes of motion like in the golf swing.
Watch Patrea demonstrate the 'side sit up' series on a reformer that will help you improve your golf swing.