Top 7 Low-Impact Knee Strengthening Exercises For Seniors

If you’re already experiencing knee weakness, high-impact exercises are not the way to go. Instead, you should gradually work your way up with low-impact exercises that do not exacerbate your condition. Here are seven of the gentlest knee strengthening exercise routines for seniors.

1. Quad Sets

This is an isometric exercise that strengthens the quadriceps without moving the knee. It’s great for beginners or those with limited mobility.

How to do it:

• Sit upright on a mat with a towel rolled under the target knee. 
• Extend this leg straight in front of you.
• Bend the other leg, placing the foot flat on the floor for support.
• Flex your foot and press the back of your knee into the towel.
• Place your hand on your thigh to feel the muscle contraction.
• Hold for 10 seconds while breathing steadily.
• Slowly relax and return to the starting position.
• Repeat 10–15 times on each leg.

2. Leg Raise

This exercise strengthens the quadriceps and hip flexors while keeping the knee stable.

How to do it:

• Lie on your back with one knee bent and the other leg straight.
• Tighten the thigh muscles of your straight leg.
• Lift your straight leg until it’s at the same height as your bent knee.
• Hold for a few seconds, then slowly lower it back down.
• Repeat 8-10 times per side.

3. Seated Knee Extensions

This movement helps build quadricep strength and improve knee stability.

How to do it:

• Sit tall in a chair, feet flat.
• Slowly straighten one leg until it’s parallel to the floor.
• Flex your foot (toes toward you) to engage muscles.
• Hold for 5 seconds, then lower slowly.
• Repeat 10 times per leg.

If you can’t fully extend your knee, don’t force it. Extend only to a comfortable range and gradually work on improving flexibility and strength.

4. Standing Hamstring Curls

This exercise strengthens back thigh muscles to support the knees.

How to do it:

• Stand behind a sturdy chair, holding for balance.
• Bend one knee, bringing your heel toward your butt.
• Keep your thighs parallel (don’t swing!).
• Hold for 2 seconds, then lower slowly.
• Repeat 10 times per leg.

5. Calf Raises

This exercise boosts calf strength to take pressure off the knees.

How to do it:

• Stand holding a chair or countertop.
• Slowly lift your heels off the floor (rise onto your toes).
• Hold for 3 seconds at the top.
• Lower heels back down gently.
• Repeat 10 times.

If balance is tricky, lift one heel at a time.

6. Step-Ups

This exercise builds strength in the legs and improves knee function.

How to do it:

• Stand in front of a low step or sturdy stool (4–6 inches high).
• Place one foot fully on the step.
• Press through your heel to lift your body up.
• Bring the other foot to meet it.
• Step back down slowly.
• Repeat 8 times per leg.

7. Clamshells/Seated Clamshells

This workout strengthens hips to prevent knees from collapsing inward.

How to do it:

• Lie on your side with knees bent and stacked.
• Keep your feet together and lift your top knee (like opening a clamshell).
• Hold for 2 seconds, then lower slowly.
• Repeat 10 times per side.

If you can’t lie down, try seated clamshells:

• Keep your back straight and your feet flat on the floor.
• Place a resistance band around your thighs, just above your knees.
• Sit tall, and keep your hands resting on your thighs or the sides of the chair for support.
• Press outward against the resistance band as far as it is comfortable.
• Hold for 2–3 seconds
• Slowly bring your knees back together.
• Repeat 8-10 times

Exercising Safely With Weak Knees

• Start Slow: Avoid overexertion. Begin with gentle movements and gradually increase intensity.
• Use Proper Support: A sturdy chair or handrail can help with balance.
• Avoid High-Impact Moves: Steer clear of jumping or deep squats that strain the knees.
• Listen to Your Body: Stop if you feel sharp pain. Discomfort is different from pain.
• Warm Up & Cool Down: Gentle stretches before and after exercise help prevent stiffness and injury.

Final Thoughts

Stronger knees mean better movement and less pain. Building knee strength takes time, but every small effort adds up. For extra guidance tailored to your needs as a senior, try the Seated Knee Strengthening & Stability Digital Class—no floor work required! This expert-led class focuses on safe and effective knee strengthening exercises for seniors, helping you stay active & independent. Join now to keep your knees strong, stable, and ready for life’s great adventures.