Key Son is a Certified Personal Trainer. He graduated from Cornell University and is certified by the National Academy of Sports Medicine. 

His theory involves circuit training with low-impact, modified exercises, which apply stress specifically to the areas the client wants to work on and, as a result, the body responds by toning and tightening.

Son's work has been featured in Allure, Glamour, V Magazine, Elle, Vogue, and Fitness Magazine. He trains in the West Village of New York City.