Sprint legend Michael Johnson believes Usain Bolt should consider moving up to 400m after an impressive relay display. Bolt clocked a 43.58-second split in a 4×400 relay at a local meet in Jamaica 10 days ago. American Johnson’s world record from a standing start is 43.18 sec and his best split time in a relay – from a rolling start – was 42.94. “He has the ability to be a world record holder. If it were me, I would move to the 400 now,” said Johnson.