Husband-and-wife duo Xavier and Nadia extend their matrimonial partnership to the workplace at Body By X—Nadia manages the business side, and Xavier (known to many as simply "X") trains clients to overcome their physical and emotional obstacles. In addition to racking up numerous client success stories, Xavier's skill also earned him the honor of Best Personal Trainer 2010 on the San Francisco Bay Guardian's Best of the Bay list. A devoted father, mentor, and coach, Xavier's philosophy centers on personal growth, embracing the idea that the only way to learn is through trying, failing, or absorbing new muscles through osmosis.
Fitness renovations take place in Body By X’s welcoming facility, where trainers help clients develop their bodies in pursuit of goals such as losing weight, gaining weight, improving bone density, or boosting confidence. The facility houses free weights and cardio machines as well as a fly gym, where Nadia leads students through exercises that combine yoga and Pilates fundamentals with a suspension-cable system. Trainers also lead classes such as yoga, rowing, and cycling, as well as sport-specific training for athletes and personal training for individuals.