For British track and field fans there are few sights more thrilling than Dina Asher-Smith going supersonic. It is not just her speed that rips the breath away, it is the economy of movement and sense of imperious power as she glides clear of a world-class field.
No wonder a near sell-out crowd in Birmingham roared as Asher-Smith powered to a British 60m record of 7.03sec in her heat of the World Indoor Tour finals, before leaving world and European champions gasping behind her in winning the final in 7.05.
