At 89 years, he took seriously to running and ended up in international marathon events. When he first turned up for training at Redbridge, Essex, he was dressed in a three-piece suit. The coach had to rework everything, including his attire. Singh ran his first race, the London Marathon, in 2000. According to his coach, he used to run up to 20 kilometres easily and wanted to run a marathon, thinking it to be just 26 kilometres and not 26 miles (42 kilometres). It was after he realised this that he began training seriously.