Raise your arm and find your backswing limit

Stand up and raise your trail forearm like you're waving. That's it. However far you can go before the elbow starts winging out is exactly how far your arm should go in your backswing. No more. No less. Most golfers either force the arm past that point or recruit the wrong motion entirely, trying to get more length at the top. Both of them break the swing frame and make a consistent top of backswing nearly impossible to repeat. 90 degrees is the goal. If you can get there, that is enough. If your shoulder stops short of that, that is your end range of motion, and that is perfectly fine, too. Work with what your body gives you, not against it. This is checkpoint three of four. Watch the full video on YouTube to see how all four stack together into one automatic, repeatable backswing you can rely on every single time.