Originally Posted by
mike868y
I think it should be stated that these intervals are next to impossible without a PM. Sure you can try it, but it is nearly impossible to pace yourself well.
I usually can usually do these without PM because I have well over 200K miles in my legs on a bike and so I am pretty well self-calibrated. Even so I screwed up royally trying to do this once recently and way overcooked the first 4. The other times I have done these were pretty close to on target by feel.