McGwire's Fitness is a family-friendly fitness center for people of all ages and abilities. Our beautiful main location in Ontario, California offers some of the finest programs, trainers, facilities and equipment in the entire country.

We offer a wide range of specialty programs from kids to seniors including youth fitness programs, performance programs for athletes, senior programs, weight management and special populations programs, as well.

The most important factor in your training program will be your trainer's ability to inspire and motivate you. This is the life of discipline that Jay McGwire not only lives himself, but passes on to his expert trainers!

Discipline in fitness and in a healthy, balanced diet. Jay's knowledge of natural and nutritional foods to optimize the body's natural building systems is integral to a productive body-sculpting experience.

Let our array of inspiring trainers take you to the next level while you have the fun of enjoying your new body. Excite in the prospect of the new you as it unveils itself. Drop us an email or just drop on by the facility for an evaluation and consultation session.

Let's get started today!