 leg speed) in her races, although she also has "well developed" stride length.On average, she covers the 100 m within 50 strides, and has a cadence of about 286 steps per minute.Her world 100 m final from 2009 took 49.58 strides — equivalent to two metres per step, with her longest stride of 2.2 metres seen over the last 20 metres of her race.