TRUSTED BY TOP PROS AND COACHES: Used by MATT FITZPATRICK to gain the speed necessary to win the 2022 US OPEN and trusted by Golf Digest’s top instructors, MARK BLACKBURN and CHRIS COMO as the top golf swing trainer for gaining distance. PROVEN SPEED GAINS VIA SCIENTIFIC RESEARCH: An analysis of over 35 MILLION SWINGS from more than 55,000 USERS shows average speed gains of 10.1 mph. TheStack is an ideal training tool for golfers seeking measurable, lasting results. 30 WEIGHT OPTIONS FOR PRECISE TRAINING: TheStack is engineered with 30 adjustable weight combinations, allowing PRECISE OVERLOAD AND OVERSPEED training that targets your specific needs to maximize training efficiency. AWARD-WINNING APP WITH PERFORMANCE TRACKING: TheStack App, available on iOS and Android, COACHES you with timed sessions, TRACKS your personal bests, and COMPARES you to other Stackers. A 1-year membership to the App is included with purchase. FULL-FEATURED PUTTING TRAINER APP INCLUDED: Stack Putting, seamlessly integrated into the Stack App, delivers GUIDED PUTTING PRACTICE SESSIONS and provides deep insights into your tendencies, helping you improve both your short game skills. iOS only. OPTIMIZE SWING MECHANICS: Access 60+ expert videos on swing mechanics, speed drills, and golf biomechanics, curated by DR. SASHO MACKENZIE. Practice the same moves that top PGA pros and coaches rely on to build serious speed. Available on iOS and Android. REQUIREMENTS: TheStack App now supports both Apple (iOS 15.0 or later) and Android devices. A separate radar device capable of measuring non-contact swing speeds is required. Unlock your full swing potential with The Stack System, a cutting-edge golf swing trainer designed for golfers of all ages and skill levels looking to hit the ball farther. Both PGA Tour winners, such as Matt Fitzpatrick, and amateur golf champions around the world trust the #1 golf swing training aid for speed gains. This innovative golf swing speed trainer, created by world-renowned golf researcher Dr. Sasho MacKenzie, is your key to gaining clubhead speed and maximizing your distance potential.​ TheStack is a single weighted golf club, outfitted with precision hardware, that offers 30 unique weight combinations. Included with the golf swing trainer hardware, is an award-winning app that leverages dynamic programming to provide the best speed training experience in golf. The Stack System isn’t just another golf swing stick. The training programs were founded on years of scientific research and have been refined by analyzing millions of golf swings from dedicated “Stackers” that have gained serious speed. The Stack System serves as your personal golf trainer and will continuously analyze your golf swing’s force-velocity profile to curate customized training programs. The app will seamlessly guide you through each training session at the perfect tempo with a targeted golf warm-up, specific swing instructions, and dynamic rest timers. The result is a gamified training experience in which the app tracks personal bests, celebrates new speed records, monitors your Grit Score and compares progress with other Stackers that are your age. Unlike other golf practice sticks, The Stack System uses precision overload and overspeed stimuli via the 30 loading options to efficiently target your specific speed training needs. The app includes over 60 swing tip videos, so golfers can practice the correct swing mechanics while training. With a bonus putting app included, The Stack System golf swing trainer offers guided putting sessions and insightful data on your tendencies. Plus,