Everyone wants to bomb it like John Rahm with that short, aggressive backswing. Couple of words of caution before you try and employ that to your swing.
A younger, stronger and aggressive golfer still has the wrist, hand and forearm strength to set and square the club correctly. Timing, power and speed are key in this move.
Older, stiffer golfers get so short in their backswings that they then try to attack with hands only for speed leading to very inconsistent strikes. I tell all students that I don’t think your backswing will ever get too long. Short, quick and unbalanced is what I see with short backswings. If you can make it work fine but be careful about being too short. Good luck and find the swing that matches you with the help of a PGA Professional!!