Mike Ling Came to America to Study Medicine. Now He Runs a Successful Fitness-Tech Company. It All Came Down to Passion. Posted byKenny Au January 15, 2021 Leave a comment on Mike Ling Came to America to Study Medicine. Now He Runs a Successful Fitness-Tech Company. It All Came Down to Passion. The 43-year-old FitTime founder sheds light on how a plant-based diet, meditation and Jiu-Jitsu helped him become sturdier and more successful.