This is a great example of what I would call the “modern” swing, which incorporates restricted lower body movement in the backswing, plenty of both lateral and rotational movement in the forward swing, and a “drive/hold” release pattern, what I would previously term a “sustained” impact, where the right wrist stays bent well past impact as the clubface closes, causing the shaft to stay in line with the left arm until the hands move past the right leg in the follow through. These traits are evident in the swings of Dustin Johnson and Jordan Speith among others (Lee Trevino also comes to mind, which would of course make him ahead of his time), and the main benefit is clubface control (a slower rate of face rotation) through the impact area. Koepka seems to have a relatively weak grip (I can’t be sure from the videos), which allows him to bow his left wrist without overly shutting the face, and it stays that way throughout the swing, something normal people cannot do without hitting smother hooks as they have neither the pivot movement or the speed necessary to keep the left arm pulled by the body and have the right hand keep up and apply pressure to the left thumb. Koepka keeps his clubface somewhat closed in the takeaway and his right upper arm well in front of him, which again are usually big problems for regular golfers but no problem for someone as strong and talented as Brooks. Another example of the modern swing is the resisting lower body, with the left heel firmly on the ground and the overall backswing leg movement minimized. Koepka uses the ground as well as anyone as evidenced by the amount he lowers while keeping his head out over the ball. All in all, it’s a powerful, athletic swing that looks as though it could be contending for big titles for a long time.