Racer1 what i am trying to say is something that Renato always says is that everything affects the other training. If an 800 meter runner works too much on endurance and not enough on anerobic then it may help if it is the direction he needs but if Kennedy worked too far from endurance wouldn't he be taking from his Strength endurance that he was so good at and perhaps adding overload. What kennedy had was amazing fatigue resistance. Look at his 3k of 7:30. I'm not saying he shouldn't be developing his speed but where do you draw the line between spending hours on drills or too much enzymatic speed. He was already doing three track workouts most the year. I just think that the direction to work on speed can't hinder the endurance training related to the specific event. So to work too much on speed it can hurt endurance and too much on endurance it will hurt speed. "Individuate the speed you can reasonable develop and then extend into specific endurance" From Canova. I just think that using Kennedy as a example is hard because you never know how his body would have reacted to this different direction. Now if he was magically much faster with the same endurance then fantastic. Also using Bekele sprint without lactate is not correct. He was still recruiting type 2 fibers while lactate was present just not a massive amout for him but still well above 4mmol.