6 Workouts to Strengthen Knees That Actually Work Backed by PTs

These six workouts to strengthen knees by building up the supporting muscles: the quads, hamstrings, glutes, hip abductors, and core. These exercises will help your knees track better, provide more support, and get stronger, all without equipment and from the comfort of your own home.

Strong and stable knees are pain-free knees. If you have difficulty exercising or experience pain, your quads, glutes, hamstrings, or hip stabilizers are likely weak. This leads to improper tracking of your knees.

6 Best Workouts to Strengthen Knees at Home

1. Wall Sit

Muscles Worked: Quadriceps (front thigh – especially vastus medialis for kneecap stability), glutes, core

How to Do It step by step:

1. Stand with your back flat against a wall — feet about 2 feet (60 cm) away from the wall, hip-width apart.
2. Slowly slide your back down the wall until your thighs are as close to parallel to the floor as comfortable (knees at approximately 90° — or higher if needed).
3. Keep knees directly over ankles — do not let them cave inward (gently push knees out toward pinky toes if they drift in).
4. Engage your core — pull belly button toward spine, keep chest lifted, shoulders relaxed, arms relaxed by sides or crossed over chest.
5. Hold the position — breathe steadily (inhale/exhale normally, don’t hold breath).

6. Hold: 15–60 seconds × 3 sets (start at 15–20 seconds and build up weekly)

Why It Works: This isometric hold builds incredible endurance in the quadriceps — the large muscles that stabilize the kneecap and support the joint during walking, running, squatting, and daily activities. Strong quads reduce knee stress, improve tracking, and prevent pain from poor alignment.

Tip: If 30 seconds is too long, start with 10 seconds and add 5–10 seconds each session. Keep your core engaged to avoid slouching or lower-back arching.

2. Glute Bridges

Muscles Worked: Gluteus maximus (primary), hamstrings, core, lower back stabilizers

How to Do It step by step:

1. Lie on your back — knees bent, feet flat on the floor hip-width apart (heels 12–18 inches / 30–45 cm from your buttocks).
2. Arms relaxed by your sides or crossed over chest.
3. Engage your core — press lower back gently into the floor (slight posterior pelvic tilt — tuck tailbone slightly).
4. Exhale → drive through your heels, squeeze glutes hard, and lift hips toward the ceiling.
5. Body forms a straight line from knees → hips → shoulders (no arching lower back).
6. Hold 2–3 seconds at the top — squeeze glutes maximally (feel the contraction).
7. Lower slowly with control — hips hover just above the floor (don’t fully rest).

8. Reps: 12–20 reps × 3 sets

Why It Works: Strong glutes are essential for pelvic stability. When the glutes are weak, the knees must compensate, which can lead to poor alignment, inward collapse (valgus stress), and strain. This exercise directly targets the gluteus maximus to keep your hips level, your knees tracking correctly, and your lower back protected.

Tip: Focus on using your glutes, rather than your lower back, to initiate the movement. Avoid excessive arching of the back. Imagine you are pushing the ceiling away with your hips.

3. Straight Leg Raises

Muscles Worked: Quadriceps (especially rectus femoris), hip flexors (secondary)

How to Do It step by step:

1. Lie flat on your back on a mat or soft surface — one knee bent with foot flat on floor (for lower-back stability), other leg completely straight.
2. Engage your core — press lower back gently into the floor (slight posterior pelvic tilt — tuck tailbone slightly).
3. Tighten the quad of the straight leg (push kneecap toward ceiling) — lift the straight leg 6–12 inches off the floor (to the height of the bent knee or as high as comfortable without pain).
4. Hold 1–2 seconds at the top — squeeze the quad hard (feel the contraction in the front thigh).
5. Lower the leg slowly with control for 3–4 seconds — stop just before it touches the floor (maintain tension).
6. Complete all reps on one leg, then switch sides.

7. Reps: 15–20 per leg × 3 sets

Why It Works: This low-impact exercise isolates the quadriceps without putting pressure on the knee joint itself. It’s perfect for beginners or those recovering from injury to gently rebuild quad strength and neuromuscular control.

Tip: Keep your toes pointed toward the ceiling and your pelvis stable. Don’t rock your hips or arch your lower back. Move deliberately; slow repetitions build strength faster than fast ones.

4. Step-Ups

Muscles Worked: Quadriceps, glutes, hamstrings, core, stabilizers

How to Do It step by step:

1. Stand in front of a sturdy step, box, stair, or low bench (6–12 inches high to start — higher as you progress).
2. Step up with your right foot — drive through the heel to bring your left foot up to meet it (stand tall at the top).
3. At the top, squeeze your right glute — stand fully upright (chest up, shoulders back).
4. Step down with left foot first, then right — controlled descent (lead with heel, don’t bounce).
5. Alternate leading legs or complete all reps on one side before switching.

6. Reps: 12–15 per leg × 3 sets

Why It Works: Step-ups mimic real-life movements, such as climbing stairs or standing up from a chair. This exercise builds strength in your quadriceps, glutes, and hamstrings, while also improving balance and coordination, which are all vital for knee health.

Tip: Keep your torso upright and your knee aligned over your ankle as you step up. Don’t let your knee collapse inward (valgus stress). Drive through the heel of the working leg — not the toes.

5. Straight Leg Raises

Muscles Worked: Quadriceps (especially rectus femoris — crosses hip and knee), hip flexors

How to Do It step by step:

1. Sit tall on the edge of a sturdy chair — back straight, core lightly engaged.
2. Extend one leg straight out in front of you — foot flexed (toes pointing toward ceiling).
3. Engage the quad of the straight leg — tighten the front thigh muscle (push kneecap upward).
4. Lift the straight leg to parallel with the floor (or as high as comfortable without pain or leaning back) — keep leg straight (slight bend in knee if tight).
5. Hold 1–2 seconds at the top — squeeze the quad hard (feel the contraction in the front thigh).
6. Lower slowly with control for 3–4 seconds — stop just before the foot touches the floor (maintain tension).
7. Complete all reps on one leg, then switch sides.
8. Reps: 15–20 per leg × 3 sets

Why It Works: This variation emphasizes the rectus femoris (a quad muscle that also crosses the hip) and the hip flexors. Strong hip flexors help maintain proper posture and gait, reducing strain on the knee.

Tip: Engage your core to prevent leaning backward or arching your lower back. Move slowly and deliberately, focusing on a quad squeeze rather than speed. Exhale as you lift to activate your muscles more strongly.

6. Side-Lying Leg Lifts

Muscles Worked: Gluteus medius & minimus (hip abductors), tensor fasciae latae, core stabilizers

How to Do It step by step:

1. Lie on your right side — legs straight and stacked (bottom knee can bend slightly for stability if needed).
2. Rest your head on your right arm or a pillow — left hand on hip or floor for balance.
3. Engage core — keep hips stacked (no rolling forward or backward).
4. Flex your top (left) foot — slowly lift left leg 6–12 inches (or higher as strength improves) — keep leg straight and in line with body.
5. Hold 1 second at the top — squeeze outer hip/glute hard (feel the contraction on the side of your butt/hip).
6. Lower slowly with control — stop just before leg touches the bottom leg (maintain tension).
7. Complete all reps on right side, then switch to left side (right leg lifts).

8. Reps: 15–20 per leg × 3 sets

Why It Works: The hip abductors (gluteus medius and minimus) are critical for stabilizing your pelvis when you walk or run. Weak abductors cause your knee to dip inward (“valgus collapse”), which is a major contributor to knee pain and injury. This exercise directly combats that.

Tip: Keep your hips stacked and your top leg aligned with your body. Imagine you’re squeezing a coin between your knees to engage the correct muscles. Don’t let your hips roll forward or backward. Exhale as you lift to activate your glute medius more strongly.

Do these six workouts to strengthen knees. You’ll build stable, pain-free knees that can support your HIIT workout and daily life.

Last Updated: April 2026 – Completely Rewritten