Athlete, actor and activist Aimee Mullins talks about her prosthetic legs -- she's got a dozen amazing pairs -- and the superpowers they grant her: speed, beauty, an extra 6 inches of height ... Quite simply, she redefines what the body can be.

Aimee Mulllins defies conventional description, both on and off the track. As an athlete, she holds world records in a number of track events. She is a model, actress and speaker. The fact that she is a bilateral below-the-knee amputee, born without fibula bones in both shins, has not hindered her success in any way. In fact, Aimee has used it as a springboard to an illustrious, varied career that defines the idea of 'no limits'!