How can you make a human being fly? “Extreme action architect” Elizabeth Streb and her “lab for action mechanics” want to know. As a young woman in the 1970s, Streb challenged the convention that dance had to be gentle and began an exploration of the limits of the body in space. Using gigantic wheels and whirling steel I-beams to challenge her ensemble, Streb pushes her dancers to the edge of what the human body can do. Her dances are enthralling, inspired by athletics, boxing, rodeo, circus, and Hollywood stunt work. Director Catherine Gund creates a dual portrait: of Streb—obsessive, driving, creative—and of the eclectic team of dancer-cum-athletes who seem able to perform any feat. Starting with rehearsals, the film culminates in a series of mind-boggling public performances staged on city landmarks for the 2012 London Olympics. Streb knows her daring choreography puts her dancers in danger but thinks that you must risk falling if you want to fly.  LB