Sentence:  It is made up of tumbling , which might be said to start with a somersault , run through such stunts as headstands , handstands , cartwheels , backbends , and <WSD>culminate</WSD> in nearly impossible combinations of aerial flips and twists and apparatus work . 
Meaning of the word marked with <WSD> tags:  end, especially to reach a final or climactic stage