7 februari 2011 kl 15:35
Mikael is right on,Build up from the pace he can now run in the mile, then slowly bring done the speed. Jumping into efforts 4min15sec are either going to injure him or he would only finish a few efforts which he is getting nothing out of.
if you haven't been running any intervals before, start with some fartlek over rolling terrain like a golf course with the efforts just a solid pace nothing too full on. then after a period start the intervals. Depending on when your race is planned