When running short intervals, never run all out, instead think 90%. There is little additional return going faster and the risk of injury rises significantly. Instead look for a good turnover and rhythm to your running. For moderate, medium then mad workouts, the last 1/3rd at mad is meant to be pushing the pace, but as we have already been running at a good effort by the time we arrive at the last 1/3rd (and it is a continuous run), our speed is already governed by our fatigue. We are not sprinting, just pushing the pace with what we have left! The same as in the last part of a triathlon race. On race day the race is ‘just like training’.