The Stack System

Unlock Your Distance Potential The Stack System is the most advanced speed training product in golf. Co-developed by leading biomechanist Dr. Sasho MacKenzie, it uses dynamic variable inertia to safely increase your clubhead speed.
The Hardware:
5 CNC Milled Weights: Create up to 30 unique weight combinations to overload and underload your swing safely.
Engineered Shaft: Feels like a premium driver to translate speed directly to the course.
The AI Training App (Included): Don't guess—follow the science. The App functions as your personal trainer.
Custom Programs: AI formulations based on your strength and speed profile.
Guided Workouts: Built-in timer for reps, sets, and rest intervals.
Metric Tracking: Monitor your "Stack Speed," "Distance Potential," and "Grit Score."
Family Sharing: Train up to 20 local users under one login (perfect for families).
Compatibility Note: Stack training works best with a speed measurement device. We recommend bundling this with the Stack Radar (available in our store) for seamless Bluetooth data tracking.
"TheStack is by far the best speed training system available to golfers." — Chris Como, Coach to Bryson DeChambeau