A favorite institution in Philadelphia is celebrating a birthday May 27. The 12th Street Gym has been a place where people from all walks of life, gay and straight, have gone to transform their lives and bodies, meet friends old and new. Not just a gym, it is part of the Camac Center, which boasts a hair salon, holistic services, massage (our favorite) and the children’s gym, where you can send the little ones before, after and during school hours. They even have a psychic reader. For the 25th anniversary, we spoke with owner Rick Piper.