It requires both sprint and distance elements.
For instance, the following is Will Sumner training according to Will himself:
Will: In terms of mileage, I’d say I graduallybuilt up from my first fall week until the lastweek of training, before indoors started. Ikind of go up a little bit and then plateau, andthen go up a little bit and plateauonly by three miles every, two or three weeks.I started at four or five miles in the first week, and then built up to about 18 by thefirst meet. After that I kind of just stoppedcounting my miles because I didn’t really runas much after that. In terms of a weeklyworkout schedule, basically we’ll do some short speed work on Mondays, usually it’s likeforties and eighties and stuff like that,working on just speed, turnover, things likethat. Tuesday I usually do my aerobic work,so I’ll go with the distance guys, justrun tempos or VO2max workouts.Wednesday, typically I’ll go with the sprintgroup and either do a workout with them orjust like their drills. Thursdays off. Friday is usually the hardest workout of the week, soI’ll do either an 800m workout, a mileworkout, or a 400m workout. Saturday ismy long run, but like I said, the longest I everran was six miles and mostly I’m only doinglike three or four miles.
So, if Will were just training as an all out sprinter (400 and below) he wouldn’t be doing a long run or VO2 max stuff.