Masterskya is an amazing BJJ gym with high caliber trainers and high level grapplers. They have two locations (Bushwick and downtown Brooklyn) and are drop in friendly meaning you don't have to pay for membership, just for a class pass.
Unique things to do nearby
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Private Photoshoot at World Famous Brooklyn Bridge/Dumbo
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DUMBO/Brooklyn Bridge photo walk
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Private Photoshoot in the World Famous New York City