Knee strengthening exercises work by building the muscles that support and offload the joint — the quadriceps, hamstrings, and glutes — so the knee itself takes less strain and hurts less. The most effective, zero-impact moves are straight-leg raises, seated knee extensions, glute bridges, standing hamstring curls, and wall sits (partial). Contrary to the old belief that exercise “wears out” the knee, strengthening is a frontline treatment for knee pain and osteoarthritis. Aim for daily or near-daily sessions of 10–15 minutes, starting in a pain-free range and adding reps each week. Avoid deep squats, running and jumping while the knee is painful. Strong supporting muscles are the closest thing there is to a natural knee brace — and they build in weeks, not months.
When your knees hurt, strengthening the muscles around them is one of the most effective things you can do — it's like building a natural brace for the joint.
How does strengthening reduce knee pain?
The knee is stabilized by the muscles above and around it. When the quads and glutes are weak, the joint absorbs more force and hurts more. Strengthening them offloads the knee — which is why leading guidelines list exercise as a first-line treatment for knee osteoarthritis, ahead of many other options.
Glute bridge — hips and posterior chain support the knee.
Standing hamstring curl — hold a chair.
Partial wall sit — a shallow hold, only if pain-free.
What should I avoid while it hurts?
Running and jumping.
Deep squats and deep lunges.
Fast stairs (go slow, use the rail).
Anything that sharply increases the pain.
How often and how to progress
These are gentle enough to do most days. Start with 2 sets of 10 in a pain-free range, add a rep or two each week, and only deepen the range as strength and comfort grow.
See a doctor if the knee is hot, swollen, locks, gives way, can't bear weight, or the pain follows an injury. This is general guidance, not a diagnosis.
ZI
Written by the The Zero-Impact Method team, specialists in low-impact training for ages 40 to 90. This is general guidance and does not replace medical advice.
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Yes. Strengthening the quads, hamstrings and glutes is a proven way to reduce knee osteoarthritis pain and improve function, because stronger muscles take load off the joint.
Should I exercise a knee that already hurts?
Usually yes, gently. Work in a pain-free range and avoid impact. Mild discomfort that settles is fine; sharp or worsening pain means ease off and, if it persists, see a doctor.
Health disclaimer. This article is for information only and is not a substitute for medical advice, diagnosis or treatment. Consult your physician before starting any physical activity, especially if you are over 65 or have a condition (heart disease, arthritis, osteoporosis…). Stop and seek care in case of pain, dizziness or abnormal shortness of breath.