Michael Johnson's plan to put athletics on the fast track to big business

As four-time gold medallist Michael Johnson knows very well, athletics is one of - if not the - biggest ticket events at the Olympic Games. Ahead of the start of the Paris 2024 track and field competition, the US sprint legend explains to Sam Carp why the time is now to launch his new athletics series and how Grand Slam Track will revolutionise the sport without resorting to gimmicks.