The best way for you to actually understand what the big muscles are that you’re using to build power is understanding the sequence of movements that you actually make throughout the swing and understand when different muscle groups are being engaged. Now to just talk you through the sequence of the golf swing, I just got an eight iron in here but it kind of works the same for pretty much all the swings. When you’re getting in your set up position, you’re kind of kicking your backside out, you’re trying to get your spine nice and straight to create a spine angle in which to turn around, you’re pushing your hips back and you’ve got a nice little bit of knee flex. This is a ready position in which you’re going to hit shots from, now from that position although it’s static it is still athletic. You’re also feeling strong at this point within the technique, now on the backswing you engage first of all the hands and the arms as you move the club away and as the club moves away and as it kind of reaches this point here this is where the core starts to turn and this is where the lower half will slightly rotate with that right hip as it moves out of the way.
Then the wrists begin to hinge, the sholdures begin to turn and come up to this full backswing position here. Now at this point in time your not actually using muscles to actually generate power, you’re using your muscles to create potential energy and potential power. The turn of the shoulders moves that club away it gives width to the swing. The turn away of the shoulders and that rotation of the hips means that as the they turn through the ball they would generate more speed so on the back swing you should be relaxed. You’re not tensing up and you’re not trying to be super strong on the backswing, it’s all about building the potential power that you can use later on down the line.
So is that a full backswing position? Now from the top of the swing this is where the sequence really kicks into play about using the big muscles for power. First of all you transweight, transweight, transfer your weight onto your left side by bumping those hips down towards the target, this presses your energy into left leg and it also moves it down into the ground. From here the hips begin to clear and rotate and the upper body starts to then turn and follow, from here the hands and the arms come down and at the point of impact the hips have turned, the weight is left, all the energy is being drawn up from the big muscles in the lower half, those hands ae ahead of the ball at impact and they are what deliever that final punch of energy into the shot and then from there is that little nice little extention through. So that is how you will understand and that is how you will know what muscles do what within the swing and when they do it so this is why having big upper body muscles and being super muscular, it doesn’t really add much to the swing because they’re being used mostly in the backswing to set up the big power movements that the lower half is doing in the down swing so that is where you need to have most of your focus.