Originally Posted by Relentless
isn't that sort of like sprinting?
.............Not at all. A sprint is an all-out thing, whereas an interval is run at a slightly lower intensity and typically (though not always) done at longer distances. I mean, you're not going to sprint a mile. And, as his goal is to finish in a certain time over 1.5 miles, running sprints over much shorter distances isn't going to help him.