They are perfectly fine. Sure the body takes a pounding, but it also recovers. The most importantthing to remember is that you have to keep your body chemistry

They are perfectly fine. Sure the body takes a pounding, but it also recovers. The most importantthing to remember is that you have to keep your body chemistry as "normal" as possible. Ie, eat foods, drink water, replace electrolytes. All that will help maintain body mass and will keep you from getting pulled.