How many times have you heard, “you have a beautiful practice swing.” We have all known someone that makes a wonderful relaxed practice swing only to look like a wild man when they actually go to hit the golf ball.
The example I have for you is not so drastic an example just mentioned but they’re out there. I’ve taken a practice swing video and a real shot video and put them on top of each other so you could see if there were differences in the positions. Yes there were differences and the differences would effect any ones ball flight and consistency.
I think the big difference is that in your practice swing you’re not focused on hitting the ball a specific distance. You’re not as tempted to surge or pull with your body to accelerate the golf club. The push, surge or transfer of weight to your front foot will cause your golf club path to get steeper on your down swing. The push to your front foot will also make it more difficult to square the golf club up at impact because you have less room or time to operate in.
Confused? I think the video will help.