[gliderShip]

Torso

[bankcust08385]

That's still not specific enough. Any leading part of the torso, centroid, or average of the leading edge of it?

[nsriv]

The rule is that the winner is the first person whose torso, defined as trunk of the body, reaches the closest edge of the finish line. In practical terms that means shoulder line when leaning forward, as is evident by image in the article.