As I am currently on a cut I use high rep and high volume of workout that Dilen described in his first post. Having said that I find that high volume enables a thrashing of all muscle fibres. I am an advocate of the whole overtraining thing being blown out of all proportions. There is no way you can overtrain in one session of workout. Overtraining will occur over a period of time and be made worse by below par eating, sleeping etc. Obviously I am talking from my experience of high volume workouts. Typically say for chest and tri's I would have 12 sets for chest and say 6 for triceps incorporating the meat and potato exercises for mass. I have used low volume workouts well also, but enjoyed greater gains from high volume. High volume also keeps you in shape
If we want to do low volume lets all on chest day load the bar up with 140kg and lay there with a spotter and pump out partials, then go back and have a MaccyD's.