The F-class system

Para athletics uses a letter-and-number code to group athletes by the type and degree of their impairment so that competition is fair. 'T' denotes track events and 'F' field events, while the number indicates the impairment category — the 50s series covers athletes with limb deficiency, impaired muscle power or restricted range of movement who compete seated. F57 therefore identifies a seated throwing class, in which athletes throw from a fixed frame without a run-up.