British heavyweights David Haye and Dereck Chisora were working hard and looked to be in great shape as they showed their moves to the local media. The boxers will collide this Saturday night at Upton Park in West Ham. Over 30,000 fans are expected to witness this very anticipated grudge match, as the two fighters promise to continue the battle they started in February - when they traded punches at a post-fight press conference in Germany.