The ifrothgolf review
TheStack is a swing speed training system built around a weighted training club and an app developed by a respected golf biomechanist. You attach combinations of five milled weights to the club, then follow app-prescribed sessions over a six to ten week block. The app baselines your current speed, builds a force-velocity profile, and prescribes which weights to swing and how fast, adjusting as you progress. It is overspeed and resistance training done with proper structure rather than guesswork.
What's great
The personalisation is the real draw. Instead of a generic stick you swing, the app tells you exactly what to do each session and tracks whether it is working, which keeps you honest and motivated. The hardware is genuinely well made, the 30 weight combinations cover everyone from juniors to big hitters, and the structured protocols mean many golfers see real, recorded speed gains over a training block. Including a year of app access in the price is fair.
Worth knowing
This is not a buy-it-and-leave-it gadget. It only works if you commit to several sessions a week for weeks, and progress can stall if you skip the programme. The bigger catch: it does not measure your speed on its own. You need a separate speed device or launch monitor that can read swings without ball impact, which is an extra cost many buyers do not expect. After year one, continued full app access becomes a subscription. And like all speed work, the gains taper and you have to keep training to hold them.
The verdict
If you are serious about adding clubhead speed and will follow the plan, this is one of the most credible, well-engineered speed trainers available, and the app structure is what sets it apart. Just budget for a compatible speed device and go in knowing it rewards consistency, not impulse.
