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Welcome to MX3 Fitness

Monthly Memberships

Get One Week Free

No Initiation Fee

Look, we wouldn’t sign up for a new gym without trying it out first either. That’s why your first week is on us. Try one of our monthly memberships free for the first week at our Castro or Mission District locations.

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!


Small Group Fitness Classes

Try a Class Free

No More Than Six People to a Class

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. And, the first one is free!

I'm So In!


A Different Kind of Gym

MX3 Fitness does things a little differently. We are a reservation-based private gym with each location divided into “fitness zones.” 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, and treadmills (Castro and Mission only) 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. Simply start an account, buy a workout credit, pick a fitness zone time slot, and stop on by. Our big difference? Couples workout for the same low price! Currently only available at our Castro and Mission location. Get started here.

A Little More About Us

MX3 Fitness has fitness studios in San Francisco’s Mission, Castro and Lower Haight districts. 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. We also like puppies (so you can bring your well-behaved dog with you when you workout).