When I read the title of this article, I thought it was going to be about the figurative sense of going "over the line". I was thinking more along the line of stepping past an established boundary or pushing something past its natural limitations. I wasn't expecting a sports definition.
But the more I think about it, the expression "over the line" works equally well in both worlds. It seems like a lot of sports have rules determined by players either stepping over a line or not quite reaching a line. In football, it's all about crossing over the ten yard line and gaining a new set of downs. The only way to score points is for someone to break the plane of a goal line. Crossing over the line of scrimmage before a play starts is also a violation of the rules.