MS relapse within the previous three months;

Unable to comprehend the aims of the study and to follow test instructions;

Diagnosis of major depression (DSM-5);

Severe joint and/or bone disorders interfering with balance and gait (based upon clinical judgment);

Cardiovascular diseases;

Unconfirmed or uncertain diagnosis of MS (McDonald criteria)

Other concomitant neurological disease;

Patients already performing aerobic or walking exercise.

Effect of High Intensity Training on Motor and Cognitive Functions