There's cardio and strength-training and yoga, and then there's flipping through the air in a hammock, crunching and stretching your core like a brawny bird. The Aviary is a new boutique workout studio that opened in the sleek lower level of the historic Telephone Building. The owner specializes in trapeze arts, silks, and lyra hoops. Hammocks hang above the ground, and trainers incorporate Pilates moves into easy choreography that uses gravity and your own body as counter weight. The Aviary is an elegant and addictive alternative to grimacing in the mirror while lifting weights over and over.