If it's very very very sore until it feels painful. Then rest.

If it's just normal soreness and you can still move around. Then just take some carbs and continue the training.
After a few sets and some warm ups (around 15 minutes into your training), the soreness will go away for a day.

Make sure you do cool-downs after training to reduce soreness this time.
Light jogging, cycling, walking around, stretching.

This post has been edited by iamyuanwu: Aug 10 2009, 03:50 PM