BIOHACK YOUR BAT SPEED.

TheStack Baseball

Your Personal Trainer For Bat Speed

Dynamic Training Programs

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

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.

Order Today

Now Shipping Pro & Youth Stack Bats and Speed Tracking Radar!

TheStack Baseball Bat

TheStack Baseball Bat

$399.00 View product

Speed Tracking Radar (PRGR)

Speed Tracking Radar (PRGR)

$229.99 View product