There are options for the takeaway. This 13 year old had a great swing but because her swing path was so excellent she had trouble returning the clubface to square on several shots because of her takeaway. Watch to learn a takeaway drill to help keep the club squarer.
Every golfer has tendencies that long carry over from their "younger" swing. In this video I show a rehearsal practice swing one of my PGA players is using to slowly but surely alter his tendencies.
The plane of the left arm- whilst having a few options is best served to line up in a particular manner at the top of the backswing. This helps keep a synchronization of the shoulder turn and arm travel.
A complete shoulder turn creates power and load and also helps open up the slot for a better downswing approach. Learn the nuances of creating a nice turn that will help your game.
Backswing extension or a one piece takeaway has been muttered over and over by the greatest players of the game for decades. So why do poor golfers not adhere to this necessary feeling?