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
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.