Tony Horton, inventor of the P90X workout system, instructs a Sailor on how to properly do an abdominal exercise during a comman

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YOKOSUKA, Japan (Jan. 31, 2011) Tony Horton, inventor of the P90X workout system, instructs a Sailor on how to properly do an abdominal exercise during a command physical training session at Commander, Fleet Activities Yokosuka. Horton is in Japan touring with armed forces entertainment, holding free workout sessions and book signings for military personnel and dependents. (U.S. Navy photo by Mass Communication Specialist 3rd Class Charles Oki/Released)

110131-N-2013O-191
 YOKOSUKA, Japan (Jan. 31, 2011) Tony Horton, inventor of the P90X workout system, instructs a Sailor on how to properly do an abdominal exercise during a command physical training session at Commander, Fleet Activities Yokosuka. Horton is in Japan touring with armed forces entertainment, holding free workout sessions and book signings for military personnel and dependents. (U.S. Navy photo by Mass Communication Specialist 3rd Class Charles Oki/Released)