Anthony Sawyer "Tony" Horton Jr. (born 1958 in Westerly, Rhode Island) is an exercise instructor best known for the P90X home fitness program. His direct-response ads are the most frequently aired infomercials on American television, making him one of the nation’s most-seen personalities.

In contrast to “as seen on TV” fitness and weight-loss products that are touted as virtually effortless, Horton promotes vigorous exercise routines paired with detailed nutrition plans. Most of his programs include a progressive series of workouts, demonstrated on multiple DVDs, that are designed to be performed at home with little equipment other than dumbbells or resistance bands. After growing up in Trumbull, Connecticut, and attending the University of Rhode Island, Horton moved to Los Angeles with the intention of becoming an actor.

He was also interested in fitness, and began working out at the World Gym in Venice, California, which was frequented by bodybuilders such as Arnold Schwarzenegger and Lou Ferrigno. Disliking the bulky, stiff bodybuilder look, Horton focused on exercises for speed, flexibility, and balance, as well as muscle growth. He studied with world-class triathlete Mark Sisson, who introduced him to interval training.

Horton became a personal trainer and established his business, ASH Fitness, in Santa Monica. He trained celebrities such as Ewan McGregor, Emily Deschanel, Bruce Springsteen, and Usher, and developed workout plans for magazines such as Men's Fitness. He was also a spokesman for NordicTrack exercise machines and the host of 360, an entertainment show on the Playboy Channel.

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