Nickname: The Marine's Daughter
Age: 31
Hometown: Cincinnati
Occupation: Event coordinator

Nickname: The Obstacle Course Junkie
Age: 25
Hometown: Indianapolis
Occupation: Sales Rep

Nickname: The Wrestler
Age: 22
Hometown: Salem, N.H.
Occupation: Professional wrestler

Nickname: The Hollywood Trainer
Age: 32
Hometown: Los Angeles
Occupation: Strength and performance coach

Nickname: The Fisherman
Age: 47
Hometown: Omak, Wash.
Occupation: Horse trainer and fisherman

Nickname: The Olympian
Age: 31
Hometown: Fort Wayne, Ind.
Occupation: College track and field head coach

Nickname: The Equestrian
Age: 35
Hometown: Los Angeles
Occupation: Model

Nickname: The Boston Cop
Age: 54
Hometown: Billerica, Mass.
Occupation: Police officer

Nickname: The Yogi
Age: 38
Hometown: Houston
Occupation: Yoga instructor

Nickname: The Bikini Bodybuilder
Age: 42
Hometown: Austin, Texas
Occupation: Trainer and author

Nickname: The Machine
Age: 35
Hometown: Elgin, Ill.
Occupation: CEO of nutrition company

Nickname: The No Excuses Mom
Age: 35
Hometown: Elk Grove, Calif.
Occupation: Nonprofit founder and author

Nickname: The Triathlete
Age: 25
Hometown: Queens, N.Y.
Occupation: Personal Trainer

Nickname: The Lumberjack
Age: 26
Hometown: Colden, N.Y.
Occupation: Timbersports athlete

Nickname: The Roller Girl
Age: 39
Hometown: Chattanooga, Tenn.
Occupation: Registered nurse

Nickname: Touchdown Tony
Age: 41
Hometown: Chicago
Occupation: Sports performance coach and former NFL player