Customized variable inertia speed training - the most efficient way to increase your bat speed. The algorithms that power the dynamic programming come from years of research by leading sports scientist, Dr. Sasho MacKenzie.
Your Own Personal Speed Trainer
Be guided you through scheduled workouts while tracking Stack weight, rest, recovery, and performance gains. This information allows future workouts to be adjusted behind the scenes, so your training is optimized to maximize bat speed gains.
Tracking & Sharing Metrics
Track key performance metrics such as Stack Speed, Distance Potential, Bat Speed and Grit Score. Easily share your progress and gains.
The Stack Baseball Hardware
Dual-Purpose Weight Case
Thread Fastener
5 CNC Milled Stack Weights
Tapered Handle with Stack Grip
Dual-Purpose Weight Case
Thread Fastener
5 CNC Milled Stack Weights
Tapered Handle with Stack Grip
The Success Speaks for Itself
The speed training solution that's taken the golf world by storm
Over 40,000 golfers use TheStack System
Over 25 Million swings recorded
Average speed gains of 10.1 MPH
"TheStack is by far the best speed training system available to golfers." - Chris Como
Golf Digest #2 Ranked Golf Teacher who has coached Tiger Woods, Bryson DeChambeau, Jason Day, Jamie Lovemark & Si Woo Kim.
The Savant of Speed
Dr. Sasho MacKenzie
MLB biomechanics & bat fitting consultant
Dr. Sasho MacKenzie has worked with multiple MLB teams as a biomechanics/bat fitting consultant – including the L.A. Dodgers.
Golf’s foremost biomechanist
Dr. Sasho MacKenzie is the research practitioner behind the world’s top golf coaches - his work and theories have driven a scientific, evidence-based revolution in golf instruction and movement training.
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Now Shipping Pro & Youth Stack Bats and Speed Tracking Radar!