How Neeraj Chopra’s former coach, Dr Klaus Bartonietz, guided Keshorn Walcott to a stunning gold at Tokyo World Athletics Champions

Last year, the Chopra-Bartonietz partnership ended after the German expressed the desire to spend more time with his family. But when Walcott's manager got in touch with him towards the end of last year, his itch to coach an elite-level athlete got the better of him.