Speed Training With the Science Attached
Overspeed training is not new. What The Stack System added was structure. The system was developed with Dr. Sasho MacKenzie, a biomechanist whose research into swing speed underpins the protocols, and the result is a program rather than a set of weights. You complete a baseline session, swinging a range of Stack weights while the app records your speeds, and the app then builds a training program around the numbers you actually produced. That is the difference between training and simply swinging something heavy. The program adjusts as you progress, so the load stays appropriate rather than becoming either too easy or too punishing.
TheStack: One Handle, Adjustable Weight
The hardware is a training club with modular weights that attach to the shaft, which means one purchase covers the full range of loads a protocol calls for. Lighter setups train overspeed, heavier ones train the strength side, and the app tells you which to use on any given day. Sessions are short and scheduled across the week, typically a few times per week rather than daily, because speed adaptation comes from recovery as much as from effort.
Stack Radar: Measuring What You Are Training
Speed training without measurement is guesswork, since the whole method depends on knowing what your swing speed is doing. Stack Radar is built for the job and feeds directly into the app, so every rep is recorded without manual entry. Its use has widened beyond speed work too, covering carry distances for wedge practice and structured range sessions, which makes it useful well after your speed numbers have settled.
The App Is the System
This is the part worth understanding before buying. The hardware alone is a weighted club and a radar unit. The app is what turns them into a training system, holding your baseline, your program, your session history, and a library of instructional video. It also runs putting and wedge practice modes and can log rounds for strokes gained analysis, so it does considerably more than count speed sessions. Check the current app and membership terms at purchase, since the feature set has expanded over time.
Buy the Bundle or Build Up
TheStack and Stack Radar are sold individually and together as a bundle that costs less than buying both separately. If you already own a launch monitor or radar that measures club speed, the trainer on its own may be enough, since the app works with several third party speed devices. If you have nothing that measures speed, the bundle is the sensible route, because the protocol depends on data.
Who Uses It
Matt Fitzpatrick, Michael Kim, and Yuka Saso have all trained with it, as have Golf Digest listed coaches including Mark Blackburn and Chris Como. The company reports more than 75,000 users and over 50 million swings recorded through the app.
Not Sure Whether to Start With the Bundle?
The question is simply whether you already own something that reliably measures clubhead speed. With over 50 years of combined experience in the golf business, we are glad to get on a one-on-one call and work out whether your current setup covers it.
