Water makes up approximately 60% of your body. Its functions include moistening tissues, lubricating joints, regulating body temperature and dissolving nutrients absorbed by the body. Water is lost daily through respiration, perspiration and elimination. The human body needs water everyday to replace these losses, however the amount needed varies. A common recommendation is at least eight - 8 oz. glasses a day.
Drinking water after a massage is often recommended by massage therapists. We are taught in massage school that the intent of this practice is to help the body flush out the toxins that are released from the tissues during a massage. Massage increases circulation of blood through the tissues and may thus increase the release of toxins. Sounds logical, however more research is needed to test this theory. That being said, I still highly recommend drinking plenty of water both before and after a massage. Drinking water before a massage ensures that your muscles are well hydrated which makes them easier for the therapist to manipulate. Massage can be dehydrating. Just as in exercise, when muscles are worked they lose water and electrolytes. By rehydrating you decrease the chance of feeling sore the day after a massage. I usually feel better if I keep hydrated after receiving a massage.