When your muscles hurt, do you just continue anyways?

If your muscles are sore, they're probably still in the process of repairing themselves from your last workout. You should either do a workout that doesn't incorporate those muscle groups very much, or just wait until you aren't sore to repeat the other exercise. That's the only way your muscles will get stronger, and allow you workout with good intensity.

*edit* Wow, am I ever out of step with the rest of the board!

Well, I maintain my position. I think it's best to wait until you aren't very sore, then go again. There's no rush, and I expect you'll stop feeling much muscle soreness after the first couple of weeks.

haha the first few days of 30DS are KILLER. When I finished day 1, my quads hurt so bad I could barely walk, a couple days later they were fine. Even rolling over in bed that first 2 days made me want to cry. With 30DS you just have to work through it, it's just because your body isn't use to using these muscles. The whole program won't be like that I promise!

I have had to take a couple days off due to injury, so I deft know the difference!

your body grows and repairs itself when you rest, taking a planned rest day here and there won't hurt, and might even help, i.e. the next day you come back just that little bit stronger and fitter.

I agree re pushing on through the pain if it's just muscle soreness and not an injury... but if you're getting that much muscle soreness, make sure you are also getting enough rest. A lot of people do 30 day shred on 30 consecutive days... you don't have to do that, you can take rest days to recuperate, and like i said, this may even improve your results a little. Plan your rest days though, so you don't get into a habit of deciding to have a rest day because you don't feel like working out.... only take scheduled rest days to avoid this habit... unplanned rest days are only for injuries.

My muscles hurt. I continued anyway. Now I haven't been able to run for 7 months because I have a hamstring tendinitis. I can't recommend continuing when in pain.

Muscle soreness is little tears in the muscle. My tendinitis is tears in the tendons that attach the muscle to the bone.
Stretching is the worst thing you can do in either case. It's already long been proven that stretching does nothing to either prevent or cure injuries. Why is everyone still recommending stretching?