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Welcome to MX3 Fitness - Sonoma Location Coming Soon!

Monthly Memberships

Open Gym & Reservation-Based Fitness

The Best of Both Worlds

At our gyms in the Bay Area, we offer either the traditional open gym format or reservation-based fitness, or both! San Francisco (Noe Valley & Mission) and Sonoma (opening early summer 2026) feature the best of both worlds. Castro & Lower Haight are reservation-only. Try one of our monthly memberships free for the first week at our Castro or Mission District locations. Learn more about all the features of our new Sonoma gym.

Let’s Do This!

Personal Training

Data Driven Results

Free Fitness Assessment

Personal training that is truly personal. Our certified trainers work as trusted partners in reaching your goals, whether that be weight loss, strength gain, endurance building, flexibility or balance. We have both female and male trainers to match your specific needs and set you on the path to better fitness.

I’m Ready to Go!

Group Fitness Classes

Try a Class Free

Traditional & Small Group Fitness Classes

What is a small group fitness class? Well, it means no more than six people per class, so you can get the personal attention you need from our certified instructors to make real progress. These high intensity classes are great for weight loss, endurance and strength training. Full-sized classes will be available in Sonoma only. And, the first one is free!

I'm So In!

A Different Kind of Gym

MX3 Fitness does things a little differently at our "Best of the Bay" award-winning gyms in San Francisco’s Mission, Castro, Lower Haight and Noe Valley, and soon - Sonoma! In addition to the traditional open gym formats (Mission, Noe Valley & Sonoma), all of our gyms feature reservation-based private gyms-within-a-gym “Personal Fitness Stations.” These 200 sq ft areas have all the equipment you need to get a great workout (we’re talking squat racks, functional cable machines, free weights… the works!). You reserve a fitness zone for an hour to workout on your own and that zone is all yours. No more fighting or waiting for fitness equipment. We also have step ellipticals, rowers, assault bikes, Peloton bikes, and treadmills for cardio. Monthly memberships include keyless entry for extra convenience.

Drop-In Workouts

As part of our On Your Own workouts, we welcome drop-in day passes from locals and out of towners at our Castro and Mission locations. Simply start an account, buy a workout credit, pick a fitness zone time slot, and stop on by. Get started here.

A Little More About Us

MX3 Fitness has fitness studios in San Francisco’s Mission, Castro, Lower Haight and Noe Valley districts, and the city of Sonoma in early summer 2026. We are proudly LGBTQ-owned and operated and have been serving San Francisco since 2016. We like to think of ourselves as your neighborhood gym.