T.J. Lavin, is an American BMX rider who hosted "Spring Break Challenge" and which other show? 
Spring Break Challenge:  As with "The Challenge", T. J. Lavin was the host of "Spring Break Challenge". T. J. Lavin: Thomas Joseph "T. J." Lavin (born December 7, 1976) is an American BMX rider and the host of MTV's "The Challenge" since its eleventh season.
"The Challenge"