Assess understanding of physiological adaptations in older adults undergoing concurrent endurance and resistance training: muscular (hypertrophy, fiber-type shifts, anabolic resistance), mitochondrial biogenesis, capillarization, cardiovascular and pulmonary responses, neural and hormonal adaptations, inflammation and recovery, and the “interference” effect; include how training variables (volume, intensity, frequency, order) and age-related factors influence functional outcomes and exercise prescription.