meet the orthdx team experts at your side David Welther | Martial Artist, Sports Performance Coach, Founder of ORTHDX Natural Fitness Areas of Expertise | Tactical Fitness, Combat Arts & Weapons, Sports Performance training Adventures | Founder of Bored Club for skaters, surfers, snowboarders & onewheels. A DJ in his past life, David is a DBZ & Star Wars fan. Sarah Welther | NatFit Coach, Yoga Instructor, Nutrition & Life Coach, Founder of ORTHDX Natural Fitness Areas of Expertise | Yoga, Natural Fitness, Strength & Mobility training, Sports Nutrition & Life Coach Adventures | When not at ORTHDX, Sarah is riding her onewheel with her daughter Rouen, skating in their backyard mini-ramp, carving snow or dreaming about the ocean.