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.
Everything you need to start training
The Stack Baseball Hardware
Bat Speed Sensor
5 CNC Milled Stack Weights
Tapered Handle with Stack Grip
Threaded Fastener
Bat Speed Sensor
5 CNC Milled Stack Weights
Tapered Handle with Stack Grip
Threaded Fastener
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.
everything you need included, No radar required
Stack Sensor
Accurate Speed Measurement
Stack Sensor accurately measures Bat Speed while training to drive the dynamic and customized programming.
Easy Connectivity
Connecting to our App is seamless. Just fire up the App, waggle the bat to wake it up, and start training.
No Charging Needed
Stack Sensor is smart. It goes to sleep when not in use, so you don't need to charge anything. The battery lasts over a year and is easy to change.