The models were all college-aged women of different sizes and body types (yes!). Together they performed stepping* at the runway. Four different US teams had teamed up to do this amazing and powerful show. Just look at these fierce and strong women!
* Stepping or step-dancing is a form of percussive dance in which the participant's entire body is used as an instrument to produce complex rhythms and sounds through a mixture of footsteps, spoken word, and hand claps. Though stepping may be performed by an individual, it is generally performed by groups of three or more, often in arrangements that resemble military formations. [wiki]