Take the hands in behind the trail shoulder
To swing the club around the body rather than up and down, take the hands in and set the club behind the trail shoulder at the top, roughly in line with the middle of the trail bicep (the right bicep for a right-handed player), with the lead arm on the shoulder line. Saguto presents this top-of-backswing position as the way to swing the club around the body.
Channel: SagutoGolf
Watch official source at 11:02