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Four-time Olympic champion Michael Johnson believes if Usain Bolt refines his sprinting style  the Jamaican can run the 100 metres in 9.4 seconds.
Johnson said Bolt could absolutely run faster, but it would take a tremendous commitment on the triple world record holder's  part to do a complete overhaul of his technique.
Johnson said Bolt was not a very clean sprinter from a biomechanical standpoint, compared to America’s Tyson Gay or Jamaican compatriot Asafa Powell.
Johnson thinks Bolt is the favourite to retain his Olympic titles.