Boit won the gold at the 1978 Commonwealth Games and a bronze in the 1500 metres at the 1982 Commonwealth Games. He won the 1500 metres at the 1st African Championships in 1979. In Sebastian Coe's record breaking Summer of 81 Boit could often be seen lurking at Coe's shoulder in 1500 metre and mile races, pushing him all the way to the line as the records tumbled. In 1983 Boit ran a downhill mile in 3:28.36, the then fastest mile in history. This did not count as the world record because of the course's downhill grade. Boit ended his athletic career in 1990 breaking the Masters Division Indoor World Record for the mile in Meadowlands, New Jersey.