The book Review for Therapeutic Massage and Bodywork National Certification, states that the effects of bodywork & massage are:

General physical effects

Improves overall blood and lymph circulation
Hastens healing
Removes toxins and metabolic wastes
Balances pH levels
Increases joint range of motion
Increases flexibility and mobility
Breaks downs adhesions or scarring
Reduces pain and inflammation
Increases cellular metabolism

Effects on skin

Increases blood flow; which improves skin health
Facilitates Sebaceous secretions

Effects on muscular system

Stretches muscles
Promotes muscle relaxation
Improves muscle tone
Relieves muscle spasms, cramps, and pain
Promotes healing
Improves athletic performance

Effects on nervous system

Alleviates pain directly, via the nervous response
Promotes homeostasis in the parasympathetic and
sympathetic nervous systems
Promotes natural release of pain killers, endorphins
Psychological benefits
Reduces stress
Encourages better nutrition, exercise, and health practices
Reduces emotional pain
Reduces fatigue, both physical and emotional
Increases productivity
Promotes a sense of confidence and control
Promotes deep relaxation
Encourages positive self-image and sense of self-worth
Promotes feelings of being healthier and invigorated

Effects on the circulatory system

Delivers oxygen and nutrients to cells
Promotes vascular health and flexibility
Removes toxins and wastes

Effects on the lymphatic system

Opens lymph channels for better flow
Reduces edema
Augments circulatory system; returns interstitial fluid to blood
Effects on Respiratory System
Reduces stress /anxiety associated with respiratory problems
Relaxes muscles required for the breathing process
Promotes fluid removal from the lungs

Effects on the immune system

Strengthens immune system by reducing total load
Increases T cytotoxic cells, which decreases anxiety