Inclusion Criteria:  Aged from 65-75 and 85 and more years. 18.5 < BMI < 30 kg/m2. Older people that are still "community-dwelling", i.e., not living in a nursing-home or elderly-home.  Exclusion Criteria:  Performing regular resistance training (2 or more times per week, carrying out progressive training) in the previous 6 months. Cardiovascular diseases that are contradictory for physical activity (not included controlled Hypertension). All co-morbidities interacting with mobility and muscle metabolism of the body and that do not allow to (safely) perform the resistance-type exercise program (e.g. debilitating arthritis, spasticity/rigidity, all neurological disorders and paralysis).