Psoriatic arthritis (PsA) is seronegative arthritis that often occurs as part of cutaneous psoriasis. The disease affects the peripheral and axial joints, ankylosis occurs in the spine, and erosive arthritis can be seen in the peripheral joints. Because of the similarities it shares with rheumatoid arthritis (RA), PsA has not always been accepted as a separate disease. However, the discovery of rheumatoid factor (RF) marked a turning point and PsA became a separate entity. This was supported by new knowledge about the pathogenesis of the disease and discoveries about the role of genes and environmental factors in its development. New insights into the disease over time have led to the discovery of a number of diagnostic and treatment methods for PsA. Numerous criteria have been developed to help detect the disease and evaluate its severity, as well as guidelines to help choose the right therapy. Today, a number of pharmacological agents are used in the treatment of PsA, such as synthetic and biological DMARDs, with the help of which it is possible to achieve remission of the disease. Nevertheless, physical activity remains an indispensable therapeutic option in the fight against psoriatic arthritis. The goals in the treatment of PsA are to reduce pain and alleviate the symptoms of the disease, prevent deformities, maintain range of motion, improve muscle and bone strength as well as fitness and quality of life. In achieving all of these goals, physical activity helps greatly. It has a positive effect on the disease itself, but also on the comorbidities that are very often associated with it, primarily those related to the cardiovascular system. Therefore, it is necessary to incorporate physical activity into the treatment of patients with PsA and educate them about its importance.