Inclusion Criteria:  A minimum of 20 and a maximum of 24 non-smoking participants in the age group of 55 to 65 years old, half male and half female. Female participants must be menopausal (no menses for at least 1 year (or documented ovariectomy) and a serum FSH above 30 IU/L). Height between 158 to 190 cm with a body mass index between 20 to 30 kg/m2. Physically and mentally healthy subjects that will have successfully passed the psychological and medical screening appropriate for the age group. Participation in at least 2.5 hours of exercise at a moderate to vigorous-intensity aerobic activity per week. Willing to be assigned randomly either to the exercise or the control group.  Exclusion Criteria:  Participants must be dementia-free, drug- or alcohol-addiction free, with no history of heart attacks, no thrombosis risk, no severe allergies, no hypocalcaemia, no uric acidemia, no orthostatic intolerance, no vestibular disorders, no considerable musculoskeletal issues, no chronic back pain, no head trauma, no seizures, no ulcers, no renal stones, no gastro-esophageal reflux disease or renal function disorder, no hiatus hernia, no migraines, and no mental illness. Electrocardiogram abnormalities Anemia Low bone mineral density Medication requirements that may interfere with the interpretation of the results Recent substandard nutritional status Claustrophobia Special dietary requests (e.g. vegetarian, vegan or some other diet) Sedentary people and people that are addicted to exercise Metallic implants (pacemakers, ICDs, CRT devices, infusion pumps, cerebral artery aneurysm clips, dental implants, tissue expander etc.), osteosynthesis material Given blood in the past 3 months before the onset of the experiment Smoked (tobacco and/or marijuana (THC)) within 6 months prior to the start of the study Abused drugs, medicine or alcohol within up to 30 days prior to the start of the study Participated in another study within 2 months before study onset