The long-term consequences and sequelae of COVID-19 are still unclear; however, a vastnumber of elderly individuals have reported prolonged general weakness and muscularfatigue, leading to significant functional decline, increased risk of falls, morbidityand mortality rates. However, effective exercise intervention for such post-COVID-19patients is still not well documented. Previous studies indicate that, in general,resistance training (RT) appears to be the most effective, safe method for combating theloss of muscle mass, strength and functional capacity. The aim of investigators study isto develop/adopt an effective intervention specifically for elderly (65+) people withpost COVID-19 condition, experiencing balance disorder and muscle weakness, in order tohelp them return to pre-infection mobility and function. This will be a randomizedcontrolled study with pre- and post-intervention assessment. The participants will berecruited from nursing homes, retirement facilities, Universities of the Third Age,primary health care units (POZs), in keeping with the inclusion criteria. The patientswill be randomized to one of 2 groups: RT and control (no exercise). The participants'muscle strength under dynamic condition, balance (especially fall risk), body compositionand quality of life will be assessed pre- and post-intervention. The investigators mainresearch outcome - safe exercise protocols and interventions - will be developed to matchthe needs of the elderly in the current pandemic (and post-pandemic) scenario, in orderto maintain/improve the health, balance, muscle strength, cognitive function and,consequently, quality of life of older adults affected by COVID-19.