OTOH at times it can be good to have a shorter period of very intense training. Liken this to a training camp. However sore you are (not injured) just get up early and work hard! 3 times a day for 3 days to a week.
Overtraining? hell yeah! Listen to your body? No way!

You'll be totally wasted, but after a couple of days rest and recovery you'll have moved up a notch in your overall level of performance.

:edit: This is obviously not suitable as newbie training.