Per an ESPN article...

Quote:Tennessee Titans defensive end Jason Babin told The Tennessean Wednesday that he has received "feelers" from both the United Football League and the Canadian Football League. He also plans to start mixed martial arts training and might enter some competitions.
"I know those leagues would love to grow their awareness and if they got a certain amount of high-profile guys to join in, the money would go from the NFL pool to the CFL or UFL pool and maybe they could negotiate a TV deal," Babin told the newspaper. "Now that would scare the [stuffing] out of the NFL owners if they could pull something like that off, you know?

"So the NFL owners are fighting two fights. They are fighting a lockout fight, and they could be fighting the rise of the other leagues. They make themselves vulnerable the longer this lockout goes on."

The AFL, which has 18 teams, began its season last week. The five-team UFL begins play in early August and the eight-team CFL begins play June 30.

http://sports.espn.go.com/nfl/news/story?id=6227522

I know I wouldn't want to step into an MMA ring against this: