Japan grapples to ready Sudan wrestlers for Tokyo Olympics In a crumbling Khartoum sports hall, a dozen Nuba men in sweat-faded singlets practise wrestling moves under the critical gaze of their Japanese coach. Wrestling has been a part of the religiously and ethnically diverse Nuba culture for millennia, and many of the sinewy young athletes entered the ring as soon as they were old enough to walk. IMAGES AND SOUNDBITES