In knee osteoarthritis, which aerobic approach is recommended?

• A. Plyometrics.
• B. No aerobic exercise.
• C. High-impact activities like running on concrete.
• D. Low-impact activities such as swimming or cycling.

Answer: (D)

For knee osteoarthritis, the goal of aerobic exercise is to improve heart health and daily function while keeping knee joint stress low. High-impact and explosive movements—like plyometrics and running on hard surfaces—load the knee strongly and can provoke pain, inflammation, and further joint irritation. That’s why those options aren’t ideal for most people with OA.

Low-impact activities such as swimming or cycling are preferred because they raise heart rate and endurance with minimal compressive stress on the knee. Water provides buoyancy, reducing joint load during swimming, while cycling delivers smooth, controlled motion that strengthens muscles around the knee without jarring impact. Together, these activities improve aerobic fitness, help with weight management, and support functional mobility without aggravating symptoms.

As with any exercise plan, start gradually, aim for regular sessions (like several days a week), and listen to pain levels. Combine aerobic work with strengthening and flexibility exercises, and adjust intensity to stay comfortable and safe.