with 10 minutes of very easy running and walking. Stretch gently for a few minutes and mix in four or five 100m strides (at 90 per cent of maximum speed) to get you ready for the upcoming effort. To keep your heart rate up, move around or jog on the spot
:48 and on that day I passed through the half at 1:47 and 25km at 2:09, which was also a PB. I think it works better for longer distances - I've done sub four minutes for 1K and 23 mins for 5K but never dipped under 48 for 10K. I can run fast for short distances
