Nice post. I've never tried power training ( and probably won't-- as a non-race it's hard to justify the expense. There are other toys I could spend $1000+ on). But I am somewhat confused by it. I understand that it more accurately tells you how much work you're performing and allows for precise replication of workouts. But if the point of training is to induce adaptations by stressing the body, how does it gauge this? Assume I do the same power based workout on 2 different days. The first time I'm at a HR of x bpm; the next time, because of rest, biorhythms , etc I'm at x + 10 bpm. Haven't I worked harder the second time? Or if, as a result of training, I'm now able to do the workout at x-10 bpm,, am I not working less hard & need to increase intensity to continue to produce adaptations?And if I only use power, how will I know this?

Off the subject, I know, but I've wondered about this.