For anyone with a pipe dream of joining the circus--or interest in an exhilarating new hobby--this trapeze school on the southeast waterfront, with locations in New York, Boston and Los Angeles, is the answer. Trust is the name of the game here, and in good faith; circus-school-trained instructors, some of whom also have degrees in education, are patient, articulate teachers who also happen to perform professionally around the world. After an in-depth, on-the-ground safety and technique demonstration, students--who range from grade school kids to middle-aged moms--are cinched in to harnesses, hooked up to safety ropes, and ascend a tall, narrow ladder to the platform. After chalking palms, the "flyer" waits for the "ready, hep!" cue from below before grabbing hold of the bar and jumping off for a swing.