Leg Exercises for Bad Knees: 5 Gentle Moves You Can Do at Home

If your knees grumble on the stairs, you don't have to give up on leg day. Stronger legs often help cranky knees. The trick is choosing moves that build muscle without pounding or deep bending, and keeping every rep in a range that feels okay.

Below are five knee-friendly moves for home, a weekly plan, and a gentler swap for every move.

Why leg strength helps bad knees

Your knee doesn't work alone. The Arthritis Foundation points to the quadriceps, hamstrings and glutes as the muscles that contribute to healthy knee function and help prevent injury (Arthritis Foundation, 6 Exercises for Knee OA Pain). It adds that these muscles "act like a brace" to protect the joint (Arthritis Foundation, Exercise and Strength Training With Arthritis).

The CDC agrees that moving helps: physical activity can help people with arthritis reduce joint pain and improve function and mood, and it calls physical activity safe for people with arthritis (CDC, Physical Activity and Arthritis).

The one rule: stay in your okay range

You're looking for "working," not "hurting."

• Go slow. Two or three seconds down, two seconds up. No bouncing.
• Shrink the range before you skip the move. A smaller squat still counts.
• Mild stiffness is common at first. The CDC notes that some pain, stiffness or swelling is normal after starting a new program and should get better over time (CDC).
• Breathe out on the effort and don't hold your breath (National Institute on Aging).
• Don't lock your knees straight at the top (NIA).

• Stop if you feel sharp pain, a catch, or your knee gives way. Try the swap, and if it still hurts, save that move for another day.

5 leg exercises for bad knees

Start with the first two, then add the others as you feel ready.

1

Chair squat

Thighs & glutesKnee-friendlyBeginner

Stand in front of a sturdy chair, feet hip- to shoulder-width apart. Push your hips back like you're closing a car door with your backside, lightly tap the seat, then stand up by pressing through your whole foot. Keep your knees pointing the same way as your toes.

This is basically the sit-to-stand, which the Arthritis Foundation says can make it easier to get up from a chair, in and out of bed, or out of the car (Arthritis Foundation, Knee Exercises).

Joint-safe swap: Use a higher seat (add a cushion), or do a mini squat holding the back of the chair and bending your knees just a few inches (Arthritis Foundation).

2

Glute bridge

Glutes & hamstringsLow knee loadBeginner

This works your glutes with very little load on your knees. Lie on your back, knees bent, feet flat and hip-width apart. Squeeze your glutes, press through your heels, and lift until your shoulders, hips and knees line up. Pause, then lower slowly.

The Arthritis Foundation includes a bridge in its knee exercise set to strengthen the lower back, abs, glutes and hamstrings (Arthritis Foundation).

Joint-safe swap: Back cranky? Lift just a few inches and hold for 2 seconds. Getting down on the floor is tough? Do it on your bed.

Your weekly plan for bad knees

The CDC recommends that adults get muscle-strengthening activity on at least 2 days a week, plus 150 minutes of moderate activity such as brisk walking (CDC, Adult Activity: An Overview). It also says short sessions of 5 or 10 minutes count (CDC). Here's a gentle week that fits those guidelines:

Warm up with 5 minutes of easy walking. For upper-body and core work on the other days, see our simple strength training plan for adults over 50.

How many reps, and how to progress

The Arthritis Foundation suggests starting with one set of 3 to 4 repetitions, working up to 8 to 10 as you get stronger, then adding sets until you're up to three (Arthritis Foundation). Progress in small steps: a physiatrist quoted by the Arthritis Foundation recommends increases of about 10% to 20% (Arthritis Foundation).

Be patient. The same article notes it can take six to eight weeks to notice fitness gains, although pain, fatigue and mood may start to improve sooner (Arthritis Foundation).

When to check with a doctor

How KindFitCoach helps

KindFitCoach is an AI coach that works by text. A 2-minute quiz asks about cranky joints, equipment and time, then builds a free Week 1 plan with a form card and a joint-safe swap for every move. A weekly text check-in asks how your knees felt and adjusts your plan. It's not a doctor or physical therapist, and it will tell you to check with one when something sounds off. Launch offer: free for 2 weeks — first charge on day 16, cancel anytime before — then $7.99 a month (or $99 a year).