Unlock your speed potential from the inside out

How fast you swing can transform every part of your game. More clubhead speed means more distance, more confidence, and more birdies. To train and measure your speed gains effectively, you need a system built on science. The Stack System has redefined speed training in golf by combining an adjustable weighted training club with AI-powered programming — developed by Dr. Sasho MacKenzie, one of golf's leading biomechanists. As speed creates distance, if you want to measure, train, and maximize your swing speed, The Stack System's technology and personalized approach will get you there.

Personalized speed training can transform your game — starting now

The Stack System and its creator, Dr. Sasho MacKenzie, are specialized in the biomechanics of swing speed development. Built on years of scientific research, proven on Tour by players like Matt Fitzpatrick, and trusted by thousands of golfers worldwide, The Stack System's training programs adapt to your unique force-velocity profile. From your very first assessment, the app's AI algorithms design a customized plan — adjusting to your progress session by session — so every swing you make is bringing you closer to your speed ceiling.