Physical benefits of massage include:

Improved circulation
Decreased muscle stiffness
Decreased joint inflammation
Better quality of sleep
Quicker recovery between workouts
Improved flexibility
Less pain and soreness
Strengthened immune response

Mental benefits

Massage also has many mental health benefits. Even people who are focused on the physical benefits say they feel less stressed after getting a massage.
Other mental benefits include:

Lower stress levels
Improved relaxation
Improved mood
Decreased anxiety
More energy
Increase feeling of wellness
*Mayo Clinic Health System