Speedwork-5x800m w/ 400m rest-4 miles total

Longer and slower than the usual 200m speedwork I do. I'm going to try to add more focus in on VO2 max, not just lactate threshhold. This kind of workout helps with my aerobic ability. Hard in a different way than 200m. I guess an aerobic way as opposed to an anaerobic way--obviously, but once I think about it its true--my pulse never race but my lungs became more tired over the interval.