Pain, stiffness, and discomfort in the knees can occur due to regular repetitive stress, various body conditions, diseases, or one-time injuries.
Also, the knee joints are prone to age-related deformation due to active load throughout life. As you age, the cartilage in your knee joints can wear down. This leads to a decrease in the shock-absorbing properties of the joints and the appearance of pain and stiffness when walking, running and any other movements.
This doesn’t just apply to professional athletes. Strengthening your knees is also important for those who are far from sports. Active walking downhill, long driving, climbing stairs, prolonged sedentary work have a strong impact on the condition of the knee joints.