Aging is a physiological, irreversible process that causes changes in all organ systems. The changes that occur are divided into psychological, biological and social. Changes in the bone and muscle system are the most important for this final work. Bone changes that occur are reduced bone density and a tendency to fractures. In the muscular system, sarcopenia is seen, i.e. loss of muscle mass primarily of skeletal muscles. Due to the aforementioned changes, osteoporosis often occurs in the elderly. Osteoporosis is a systemic disease whose main characteristic is a decrease in bone mineral density and a disorder in the microarchitectural damage of bones. As a result, bone fragility occurs and the risk of fracture is increased. The greatest bone mass at a young age is important for the development of osteoporosis. Women suffer from osteoporosis more often. Risk factors can be age, gender, genetic factors, diet, and physical activity or inactivity. Osteoporosis has no specific symptoms, there is pain, but it is often a fracture of the neck of the femur and a fracture of the distal part of the forearm. Diagnosis is based on history and a complete blood count. In addition, a bone biopsy and an X-ray should be taken. Osteoporosis treatment is individual and based on pharmacological products. In addition to treatment, it is very important to carry out physiotherapy and maintain the person's functional ability. In the prevention of osteoporosis, weight training based on the principle of mechanical stress is very important. Physical activity, i.e. exercises with mechanical stress, stimulating the formation of osteoblasts. This increases bone density and prevents osteoporosis and fractures that are a consequence of osteoporosis. Physical activity, i.e. weight-bearing exercises, is recommended for people of all age groups. The physiotherapist implements an individual exercise plan according to the person's age and physical ability. Exercises should be aimed at achieving strength and power as well as time itself and increasing bone mass. It is important that they are carried out gradually so as not to cause injuries. In addition to the above, the physiotherapist also carries out education, which is very important in the way of performing exercises and performing activities of daily life.