707-224-2300 | 520 California Blvd, Napa, CA. 94559

Welcome to Custom Health Fitness

A Corrective Exercise Continuum

Bridging the Gap Between Injury and Performance

Sports Medicine Facility

Here's What Our Customers Are Saying

I was fortunate to find John back in 2015. After my RNY, I successfully lost some weight through eating habits alone, but I knew I needed to focus on building strength, stamina, and fall in love with exercise if I was ever to maintain my newfound health. With John’s energetic personality and expertise, I was able to lose weight and gain muscle definition I never dreamed of accomplishing before. It was not simply John’s strong training skills that helped me; every session I was met with his positive attitude and he never pushed me beyond my psychological limits. As a person who had been obese most of her life, I never loved exercise and avoided gyms. John’s sense of light heartedness and balance were crucial to building motivation and endurance. Moreover, John understood the unique challenges I was experiencing due to my weight loss surgery, such as numerous skin removal recoveries as well as a painful hernia repair. He helped me bounce back and keep recovering every time. I look forward to continuing my work with him with new goals—I know that he will never stop learning to new ways to help his clients.

Ann Tomaney 

After herniating a disc in my lower back, I had chronic pain for 4 years. It seemed like every time I would try a new exercise, I had pain on the right side of my back and all the way down my hip, leg, and foot. I was so discouraged and wondered if, at age 57, was my active life over? After just a few sessions of corrective exercise therapy, the pain was gone. Not only do I feel better, but I can do activities I used to do years ago, with no back pain. These sessions have given me a greater range of motion, made me stronger, and much less fearful about re-injuring myself. I can try new activities again with an optimistic outlook. Thank you!


I highly recommend John Stewart.

Before meeting John, I had already seen multiple physical therapists for numerous sessions all for the severe pain to return. John was able to not only relieve the pain from my injury but also train me to not have it return and get into top physical fitness. John is extremely knowledgeable and personable, making a difficult process enjoyable!

Anita Stevens