Okeile Stewart, coach of Olympic Games 400-metre hurdles finalist Roshawn Clarke, said he is placing a lot of emphasis on improving his speed this season as he looks to lower his times in the event. Clarke, the World Under-20 record holder in the event, recently turned heads with an impressive display of raw pace when he clocked 6.62 seconds to win his heat of the men’s 60 metres at the Camperdown Classic, a performance that underlined the new direction in his training.