How to Use a Rowing Machine With Bad Knees: Form Tips, Modifications, and What to Avoid

When my left knee started giving me trouble two years ago, the first thing my physical therapist said was "have you tried rowing?" I hadn't. Like most people, I assumed rowing was an arm exercise and went straight for the bike instead.

Turns out that was the wrong call — cycling made my knee worse because it hammered my quads without strengthening the muscles behind the knee that actually stabilize it. Rowing does both.

But there's a catch. Rowing is one of the best exercises for bad knees, but only if you do it right. Three technique mistakes can actually make knee pain worse. I learned this the hard way, and it took me a few weeks of tweaking my form before rowing felt good instead of painful.

The Three Things That Cause Knee Pain on a Rower

Dr. Sarah from The Rowing Doc (a physical therapist who specializes in rowing-related injuries) identifies three primary causes. Understanding these changes everything about how you approach the machine.

1. Over-Compressing at the Catch

The catch is the starting position of each stroke — when your knees are most bent, your seat is closest to your heels, and you're about to push off. If you let the seat slide all the way forward until your knees are at maximum flexion, you're putting your joint in its weakest biomechanical position and then asking it to generate explosive force.

Think of it like a deep squat. Get into a squat so deep your butt nearly touches the ground. Now try to stand up explosively. For most people, especially those with knee issues, this feels terrible. The muscles around the knee aren't in their optimal position to fire, and the joint itself bears disproportionate load.

The Rowing Doc's fix: shorten your stroke. Don't let your shins go past vertical. Your seat should stop well before your heels. Find the position where your knees feel comfortable, and make that your new catch point. You'll sacrifice some power, but your knees will thank you.

Shane Farmer from Dark Horse Rowing calls this "half slide" — your seat only travels half the normal distance. He uses it extensively with clients who have knee pain, ACL repairs, and arthritis, and reports that most can row pain-free at half slide even when full compression causes problems.

2. Knees Pushing Out to the Sides

This often happens without the rower realizing it. At the catch position, if your ankles lack mobility or you have larger thighs, your knees naturally drift outward to make room. When you then push off through your legs, you're not driving straight — you're driving with a lateral vector that puts shearing force on the knee joint.

A quick diagnostic from The Rowing Doc: look at your feet on the footplate during the catch. Is more pressure on the outside edges of your feet? If so, your knees are probably splaying. The fix is the same as above — don't come as far forward. Reduce the range of motion until your feet sit flat and your knees track forward over your toes, not outward.

3. Over-Extending at the Finish

The finish is the end of the stroke — legs straight, handle pulled to your chest. Some people hyperextend their knees here, locking them past straight into a slightly backward position. This shifts the load off your muscles and onto your ligaments — specifically your ACL and the structures that stabilize the back of the knee.

Stand in front of a mirror and lock your knees. Do they go past straight? If your knees visibly bow backward, you're a hyperextender. On the rower, this means every stroke ends with a small but repeated stress on your ligaments.

The fix: keep a tiny bend in your knees at full extension. It will feel weird at first — like you're not finishing the stroke. But your muscles will be doing the work instead of your ligaments, and that's exactly what you want.

The Setup Matters More Than You Think

Foot Strap Position

The Arthritis Foundation recommends placing the strap across the ball of your foot — the widest part. Too high on the foot restricts ankle mobility and forces your knees into compensatory positions. Too low provides no connection and your feet slip.

Larry Kurtz-Kelly from the Better Knees Method adds: if your thighs feel particularly tight when your legs are straight, try lowering the foot strap position on the footplate. This small adjustment can dramatically reduce how much your knees have to compress at the catch.

Resistance Setting

Start low. On a Concept2, damper 3-4. On a magnetic rower, the lowest 2-3 levels. The resistance doesn't determine workout intensity — your effort does. A damper set at 3 with powerful leg drive gives you just as good a cardiovascular workout as damper 8 with weak strokes. But damper 8 means more force through your knees on every single stroke.

As Kurtz-Kelly explains: "If you're feeling a lot through your knees during the rowing stroke, lowering the resistance on the machine will help decrease some of the pressure."

Seat Height

This doesn't change mid-session, but it matters for the type of machine you buy. Standard rowers sit 14 inches off the ground. Getting on and off requires deep knee flexion — exactly what hurts. The Concept2 tall-leg option ($1,155) raises the seat to 20 inches. The Aviron Strong sits at 21 inches. If getting up from a low position causes knee pain, seat height should be your first filter when shopping.

A Safe 4-Week Progression

This protocol is adapted from the Better Knees Method and general physical therapy principles. It's designed for someone with existing knee issues starting rowing for the first time, or returning after a break.

Week 1: Learn the Motion (5 minutes, 2 sessions)

Set resistance to the lowest level. Row at half slide — your seat only goes halfway toward the footplate. Keep your stroke rate at 16-18 strokes per minute. Focus entirely on the sequence: legs push, core leans back slightly, arms pull. Recovery is the reverse.

After each session, monitor your knees for 48-72 hours. Stiffness, achiness, or swelling that appears the next day or two days later is a signal that you overdid it or your form needs adjustment.

Week 2: Build Consistency (5-10 minutes, 2-3 sessions)

If week 1 went well (knees feel the same or better), add a third session and extend to 10 minutes. Stay at half slide and low resistance. Start noticing your breathing rhythm — it should naturally sync with your stroke.

Week 3: Increase Duration (15 minutes, 3 sessions)

Build to 15 minutes per session. You can start allowing your slide to extend slightly past half — maybe 60-70% of full range — as long as your knees don't protest. Keep the stroke rate under 22.

Week 4: Add Variety (15-20 minutes, 3 sessions)

You should now be comfortable enough to experiment. Try a slightly higher resistance for 2-minute intervals, then return to easy rowing. Try increasing stroke rate to 22-24 for short bursts. This is where rowing starts becoming genuinely enjoyable — you're fit enough to push, but controlled enough to protect your joints.

After week 4, you can gradually continue increasing duration, resistance, or stroke rate — but only one variable at a time per week. Adding duration AND resistance simultaneously is how setbacks happen.

Why Rowing Often Beats Cycling for Knee Pain

This is counterintuitive, because cycling is usually the first recommendation for bad knees. But Dark Horse Rowing's Shane Farmer makes a compelling case against defaulting to the bike:

Cycling is quad-dominant. Your quadriceps do most of the work, and over time, this creates an imbalance where your quads pull on the patellar tendon harder than your hamstrings and glutes can counterbalance. The result? More anterior knee pain — the exact kind that runner's knee and chondromalacia patella cause.

Rowing uses the full leg — quads push at the beginning, but hamstrings and glutes contribute heavily through the drive, and the recovery phase provides gentle, passive flexion. This builds balanced leg strength that actually supports the knee joint rather than just loading one side of it.

That said, cycling is still a good option. The point isn't that bikes are bad — it's that rowing shouldn't be overlooked just because it's less familiar.

When Rowing ISN'T Right for Your Knees

Rowing is not a universal solution. Talk to your doctor or physical therapist before starting if:

You've had a knee replacement in the last 3-6 months. The flexion demands at the catch, even at half slide, may exceed what your new joint can safely handle in the early rehab phase.

You have acute swelling or inflammation. An actively inflamed knee needs rest, not exercise — even low-impact exercise. Wait until the swelling subsides.

You feel sharp pain (not discomfort) during rowing. Dull achiness during the first few sessions can be normal as your body adapts. Sharp, sudden, or worsening pain is your body telling you to stop.

You have unstable ligaments (torn ACL/MCL not yet repaired). The push-pull dynamics of rowing require knee stability. Without intact ligaments, the joint can shift during the stroke in ways that cause further damage.

For everyone else — arthritis, chronic stiffness, post-surgical rehab (cleared by your doctor), aging knees, runner's knee, patellofemoral syndrome — rowing is one of the best things you can do. It builds the muscles that protect the joint while keeping the joint mobile, all without a single foot strike.

If you're looking for specific machine recommendations for knee pain, check out our comparison of the best rowing machines for bad knees.

Shane Farmer from Dark Horse Rowing explains how rowing rebuilds strength around damaged knees and demonstrates the single-leg rowing modification for post-surgery rehab.

Physical therapist Larry Kurtz-Kelly walks through three ways to protect your knees on a rowing machine and a safe progression plan from 5 minutes to full workouts.