After graduating with a mechanical engineering degree from the Colorado School of Mines, Marty Jertson tried playing professional golf on the mini tours. But when he didn’t make it through Q-School, ...

One of the best things about TheStack - a swing speed trainer co-created by biomechanist Dr. Sasho MacKenzie and Ping engineer Marty Jertson - is the fact that it can be as effective as you want it to ...