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Boxer Roy Jones Jr. hits the speed bag at the Kingsway boxing gym in New York City, October 21, 2008. Jones will challenge Joe Calzaghe of Newbridge, Wales for the light heavyweight
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![Manny Pacquiao of the Philippines hits a speed bag during a workout at the Wild Card Boxing Club in Los Angeles, California, November 4, 2009. Pacquiao will challenge WBO welterweight champion Miguel Manny Pacquiao of the Philippines hits a speed bag during a workout at the Wild Card Boxing Club in Los Angeles, California, November 4, 2009. Pacquiao will challenge WBO welterweight champion Miguel](https://c8.alamy.com/comp/2E8H82T/manny-pacquiao-of-the-philippines-hits-a-speed-bag-during-a-workout-at-a-gym-in-las-vegas-nevada-march-12-2008-pacquiao-will-challenge-wbc-super-featherweight-champion-juan-manuel-marquez-of-mexico-for-the-title-at-the-mandalay-bay-events-center-on-march-15-reuterslas-vegas-sunsteve-marcus-united-states-2E8H82T.jpg)
Manny Pacquiao of the Philippines hits a speed bag during a workout at the Wild Card Boxing Club in Los Angeles, California, November 4, 2009. Pacquiao will challenge WBO welterweight champion Miguel
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Former WBA and IBF super lightweight champion Amir Khan of Britain hits a speed bag during a workout at the Wild Card Boxing Club in Hollywood, California July 3, 2012. Khan is
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