The purpose of this clinical trial is to investigate on different types of patients the effects of 10 sessions of whole-body cryostimulation (WBC): 1) in patients with obesity (BMI \> 30), we want to investigate whether WBC increases thermogenesis, basal metabolic rate (BMR), respiratory quotient (which indirectly provides an estimate of energy substrate oxidation), reduces chronic inflammatory status, fatigue and pain, and improves functional abilities and general physical and psychological capacities; 2) in patients diagnosed with fibromyalgia and/or osteoarthrytis, we want to investigate the reduction of pain, inflammatory status, increase in functional capacity and general physical and psychological abilities, and improvement in mood; 3) in neurological patients diagnosed with Parkinson's disease, Multiple Sclerosis, and Disimmune Polyneuropathies, the effects of WBC on pain, fatigue, and sleep quality are to be investigated; 4) in normal/overweight (BMI\<30 kg/m2) subjects, the effects of WBC on all parameters described previously for the other protocols are to be investigated. Specifically, for all enrolled subjects, we want to assess blood catecholamine levels, investigate the effects of sympathetic response on body composition, blood pressure, heart rate, lipid profile, and physical performance. Three hundred patients admitted for a rehabilitation program (diet + physiotherapy + exercise) will be non-randomly assigned to either a group following the program (R) or a group additionally receiving ten 2-3 minute WBC sessions at -110°C over two weeks (RWBC).