Massage increases your circulation, so more nutrients are delivered to cells.
It causes fast-healing micro tears in muscle fibers. As a result, white blood cell count increases, boosting your immune system and speeding up the healing process for injuries.
Minor muscle adhesions are reduced, and lactic acid is flushed out of muscle tissue. Both of these relieves aches.
Range of motion at various joints may be improved.
Your brain dumps the neurotransmitter seratonin into your system, which reduces your stress level and makes you feel good.