Momentus Strength Trainer with Standard Grip Includes a 52 page in-depth workout booklet with Sean Cochran,, Fitness Trainer on the PGA TOUR, FREE. Create a stronger and more powerful golf swing in just minutes a day The Momentus Strength Trainer is designed to build strength and flexibility in the golf-specific muscles. The patented counter balanced weighting technology allows you to work out with a heavier golf club for maximum impact while maintaining proper form.