CrossFit South Brooklyn was founded by David Osorio in September of 2007 in a Carroll Gardens playground. From there we moved to The Brooklyn Lyceum, a performing arts center in Park Slope, where the community continued to grow. In 2010 we signed the lease on 597 Degraw Street in Gowanus. In 2014 we added a studio space above 597, and in 2015 we expanded into a second building directly across the street at 608 Degraw Street. Today CFSBK occupies 11,200 square feet across three connected facilities on the same block. We have grown entirely organically, with no partners, investors, loans, or debt, self-funding every expansion along the way.
We are one of the largest and oldest CrossFit affiliates in the world, known internationally for our progressive coaching, effective programming, and the strength of our community. With over 700 monthly members and a staff of more than 20, we have spent 18 years building something genuinely unique and special. Everyone from people stepping into a gym for the first time to competitive athletes will feel appropriately challenged and motivated. At CFSBK, you are accepted for who you are, then immediately challenged to get better. Watch an overview of our gym here.
CFSBK strives to be an inclusive community with a strong sense of identity and social impact. We believe that a great gym is also a great citizen. Below are some of the programs and annual events that reflect who we are and the communities we care about.
At CFSBK we aim to create space for people who may not have the economic means to purchase our full or normally discounted memberships. For every 35 Group Class members we have, we offer one sliding scale membership which can be as low as $0 per month. This program aims to make access to our gym and culture more accessible and equitable for our local community. 
Fight Gone Bad is one of our oldest and largest community fundraising events, running every year since 2008. What started as a CrossFit affiliate fundraising competition became our own tradition — and one of the things we’re most proud of as a gym. Since 2008 we’ve raised over $521,000 for a variety of charitable organizations.
Since 2016 CFSBK has been hosting the annual 
CFSBK has celebrated LGBTQ Pride Month in a variety of ways over the years. In 2013 we wrote and started hosting a workout named “Stonewall” in honor of the 
In 2020 we created “Education Front Line” — a hero workout honoring the contributions teachers and administrators make every day, while raising funds for 
Every year we host our annual Memorial Day Murph event benefiting 
We love dogs at CFSBK. Since 2016 we have been putting out a “Dogs of CFSBK” Calendar with 100% of the profits going to