The more reading I do, the less productive any time below L4 seems to be outside of warmups, cooldowns and recovery. The only benefit that L2 and L3 workouts seem to produce is an increase in glycogen storage. As a road racer who races crits for the most part (I wish there were more road races around), are there any other physiological reasons to spend time in L2 or L3? It seems like any area that a racer would want to improve (mitochondrial density, aerobic power, VO2, anaerobic power, nueromuscular power, lactate tolerance, etc) is better addressed in L4-L7. I know that some people ride there when they are feeling fatigued, but am I wrong in thinking that the better solution is to rest until your legs recover and hit L4-L7 again? Training seemed so simple before I got a powermeter!