 Bolt was a member of the silver medal winning relay team with Asafa Powell , Marvin Anderson , and Nesta Carter in the 4 × 100 metres relay . Jamaica set a national record of 37 @.@ 89 s . Bolt did not win any gold medals at the major tournaments in 2007 , but Mills felt that Bolt 's technique was much improved , pinpointing improvements in Bolt 's balance at the turns over 200 m and an increase in his stride frequency , giving him more driving power on the track . 
