Question: You have discussed training frequency on your site and suggest that training a body part twice a week to every 5th day, what would you say if on that fifth day my legs are still sore and I’m generally fatigued, would you recommend waiting an additional day or so? Or just work through the soreness?
Answer: There are actually two different issues that you’re bringing up here which are the general fatigue and the soreness and I want to address them separately.
First, the easier of the two which is soreness. Simply, this doesn’t matter. Soreness appears to mainly be an issue of connective tissue damage more than anything muscularly (despite still being called Delayed Onset Muscle Soreness or DOMS) and there is no problem training through it. Most find that by the time they finish their warm-ups (see Warming Up for the Weight Room Part 1 and Warming Up for the Weight Room Part 2 for detailed information on this), the majority of the soreness is gone and even more find that as they get used to a higher training frequency soreness becomes much less anyhow. They also usually start growing better.