Approximately 80% of Persons with Multiple Sclerosis rates fatigue among the three most disabling symptoms. Aerobic, balance and strength training have already been proved effective in rehabilitation, especially for Persons with Multiple Sclerosis. Fifty-two Persons with Multiple Sclerosis will be randomly allocated to an experimental group or to a control group following usual care rehabilitation programs. Experimental group will follow a circuit training rehabilitation program which combines high intensity aerobic training with balance and strength training. The study aims to verify the effects of the circuit training program on fatigue and on balance in different contexts with respect to usual care rehabilitation programs and to investigate effects of rehabilitation on immunological markers.