Here are 10 high-performing "he-man" vegan athletes.

Carl Lewis

Track star: Went vegan in 1990; won the 1991 World Championships in Athletics.

Tim Bradley

Boxer: Fighting Manny Pacquiao on June 9 at the MGM Grand in Las Vegas.

Mac Danzig

Mixed martial artist (UFC): Ultimate Fighter 6 winner, 2007.

Scott Jurek

Ultramarathoner: Winner of multiple endurance runs; in 2010, set U.S. record for 24-hour distance run.

Billy Simmons

Bodybuilder: Won Mr. Natural Universe in 2009.

Rich Roll

Triathlete: Top finisher in 2008 and 2009 Ultraman World Championships.

Brendan Brazier

Ironman: Canadian Ultramarathon Champion in 2003 and 2006.

Mike Tyson

Boxer: Yes, that Mike Tyson. Vegan since 2010.

Robert Cheeke

Bodybuilder: Won INBA Overall Novice Champion (USA) in 2005.

Dave Scott

Triathlete: While vegan, became first six-time Ironman Triathlon World Champion. 

— Vance Lehmkuhl