Strides, or striders, are 20 seconds reps at mile pace for the purpose of this discussion. I think this is a pretty much universally agreed upon definition. Many distance coaches prescribe these as the only form of "speed work" for their athletes. Sprint coaches often prescribe alactic sprint sessions, such as 30-60m reps with full recovery as pure speed sessions. I understand that strides are designed to work on coordination and form, but these short sprint reps also do that, in fact probably even more since better form is needed when reaching top speeds, and they aren't any more tiring on the legs since there is barely any lactic acid build up from such short efforts. On top of that, it makes distance runners hit top speed, which has to have some utility. Canova and the NOP have been reputed to use all out sprints in distance training. I'm curious to hear your opinions.