Mariner Square Athletic Club - Best Athletic Club in The Bay Area - by Jimaii Design ABOUT US

MSAC is a labor of love

For over 40 years Mariner Square Athletic Club has been a staple in Alameda and the surrounding communities. We have strived to provide a little “something for everyone” from youth to seniors and Crossfitters to Yogis.

About Mariner Square Athletic Club

Mariner Square Athletic Club was built in 1978 and went by the name of Supreme Courts. During those early years it was a racquetball club which housed Nautilus of Alameda. In 1981 Kathy Wagner became the owner of the facility, complete with 16 racquetball courts, a snack bar and eight employees.


Since that time Kathy Wagner has kept up with the ever-changing needs of the community. During the mid-1980’s an indoor swimming pool was built, and the facility expanded into a full service health club. Since then, MSAC has remained committed to staying at the forefront of the fitness industry.

In early 2020 Coronavirus turned the world as we know it upside down and once again we found ourselves needing to re-invent our modus operandi. With the safety and health & fitness of our community in mind, we have recently converted many courts into private Fitness Suites, with multiple cardio and weight options in each- rentable by one to two persons in the same family or social bubble. These Suites provide a fully functioning workout space that is separate from common areas, safe and sanitized between users. Our Fit Suites are quickly becoming a popular, revolutionary way to maintain health during a global pandemic.

Our Mission

Our Mission is to retain our status in the local fitness community as one of the East Bay’s leading, largest full-service health clubs. Our philosophy has always been to maintain a non-corporate, family feel and to serve our members with a needs-based approach. Our trainers and instructors are all highly knowledgeable, certified and friendly. Our staff is committed to meeting your needs and making sure your visits to the club are smooth, productive and enjoyable.

A Message From The Owner

Thanks for supporting the club. It has been a tumultuous year of doubt and uncertainty for many of us. It’s such an honor to have such a long-standing, respected business in Alameda. I could never have made it this far without all of the loyal members, many of which have been here for several decades and counting. I hope to be able to continue to meet all of your health and fitness needs now and in the future. I promise to continue to adapt the club to whatever life throws our way, and to always maintain a safe space for you to keep moving.


Must be18 years and older. Available for first time visitors only.