agreed da rooster, you need to take time for the nervous system to recover, especially if you are sick. the most common mistake i see with bodybuilders is the never take time to rest the body properly, I remember a few years ago i was training very hard for a long peroid of time and I took a vacation for a week, I didnt have acess to weights but the diet stayed pretty good i came back from vac. and set new p.r's on all of my lifts( my body was severly overtrained), now when I get sick I stay out of the gym untill I feel about 85% back to normal and next few days are usually low on the intensity. a lot of people dont understand that it take the nervous system at least 24hr to recover after a hard workout and until the nervous system is recovered the body will have an extremly difficult time recovering the broken down muscle tissue. I think this is a major reason for delayed onset muscle sorness. The reason so may people have sucess with d.c. style training is for once their body is fully recovering from workouts.