Aye, and in a related note, people made a big deal about that one mile repeat workout that Pre did. Something like 3xmile all near 4:00 with a near full recovery. Impressive workout, but many argue that it would've been better to do 4:15 with short recovery. In other words, you don't get these breaks in a race, so why use them in practice? Of course there are places for long breaks in workouts such as those KW mentioned.