Build a Legacy, Built by Gorilla Gains No gym has been responsible for more life-changing transformations and fitness achievements than Gorilla Gains. Its where individuals build more than muscles. Its where confidence grows. Its where greatness lives. Its where legacies are built. And they are built every single day. As a member of Gorilla Gains fitness studio, gain access to the best coaches, personal trainers, and cardio and strength training equipment in Mission. With first class equipment, optimal facilities, and a dedicated community of lifters, join Gorilla Gains Mission is a no-brainer.