IBF light heavyweight champion Antonio Tarver (L) of the U.S. hits a medicine ball held by strength trainer Raphael Ruiz during a workout session at the Mayweather Boxing Club in Las Vegas, Nevada October 7, 2008. Tarver defends his title against undefeated former WBC light heavyweight champion Chad Dawson also of the U.S. at Palms Resort in Las Vegas October 11. REUTERS/Las Vegas Sun/Steve Marcus (UNITED STATES)