Knee arthritis can make everyday tasks feel hard. Climbing stairs, getting up from a chair, or walking around can lead to pain and stiffness. At Simply Physio, we help people manage knee arthritis so they can stay active and enjoy life.
Exercise is key to managing knee arthritis, but not all exercises are safe for arthritic knees. Some moves can make pain worse or cause swelling. Knowing which exercises to avoid can help you stay safe while keeping your knees strong.
Understanding knee arthritis
Knee arthritis happens when the cartilage in your knee wears down, causing the bones to rub together. This leads to pain, swelling, and stiffness. The most common type is osteoarthritis, which usually develops as we age. Movement and exercise help manage it: keeping the joint moving, strengthening the muscles around the knee, and supporting independence. But certain exercises stress the knee and lead to more pain.
Exercises to avoid with knee arthritis
These moves put too much stress on the knee joint, and can increase pain and swelling:
- Deep squats — squatting too low puts high pressure on the knee joints, especially with weak knee muscles.
- Lunges — place high stress on the front of the knee, especially with imperfect form.
- High-impact exercises — running, jumping, and high-impact aerobics increase stress on the knees.
- Stair running — the force with each step can trigger flare-ups.
- Leg extensions with heavy weights — increases pressure inside the knee joint.
- Full arc knee extensions — extending the knee fully against heavy resistance stresses the joint.
If you’re unsure whether an exercise is safe, ask your physical therapist before trying it.
Signs an exercise is too hard on your knees
Stop and seek advice if you notice pain during exercise that doesn’t ease after stopping, swelling after activity, a feeling of instability in the knee, or pain that lasts longer than two hours after exercise.
Safe exercise alternatives
There are plenty of safe ways to strengthen your knees and reduce pain:
- Straight leg raises — strengthens the thigh without putting weight on the knee.
- Mini squats — squatting only halfway strengthens the legs with less knee stress.
- Seated knee extensions (no weight) — gently improves range of motion.
- Swimming or water aerobics — water reduces joint stress while you move.
- Cycling on a stationary bike — low-impact way to improve knee mobility.
Building a safe routine
A safe exercise plan for knee arthritis typically includes a warm-up with gentle movement, strengthening for the thighs and hips, low-impact cardio, flexibility work for the legs, and a cool-down with light stretching. Avoid pushing through pain: if something hurts, stop and adjust.
Why work with Simply Physio
We assess your knee movement and strength, identify exercises to avoid, guide you through safe and effective alternatives, and build a plan that fits your life. We’ve worked with people who were scared to exercise because of knee pain and helped them learn to move safely again, including patients who’d avoided stairs for years and worked their way back to climbing them with confidence. You don’t have to manage arthritis alone.