How to Build Stronger Knees (From a PT Who’s Seen 1,000s of Them)

Most knee pain doesn’t start with one bad moment. It builds. You land a little off during a pickup game. You push through a long hike on tired legs. You sit at a desk for ten hours, then drop into a squat to grab something off the floor. None of those things alone should cause a problem. But stack enough of them on top of sleep you’re not getting and stress you’re pretending doesn’t exist, and one morning your knee just says no.

I’ve been treating patients and coaching clients for over 20 years. The pattern I see more than any other is people blaming their knees for problems their knees didn’t cause.

Your Knee Isn’t the Problem. It’s the Messenger.

The knee is a hinge. It bends and straightens. There’s a small amount of rotation built in for mechanical purposes, but that’s it. Above and below the knee sit two joints that are supposed to be mobile: your hip and your ankle.

When either of those isn’t doing its job, your knee picks up the slack. And it’s not designed for that.

A stiff ankle forces the knee to compensate during squats and lunges. Weak hips let the knee wobble inward under load. The knee doesn’t fail because it’s fragile. It fails because it’s honest. It tells you where the system broke down.

This is why isolated knee exercises are a starting point, not a solution. They help, and I’ll give you a solid routine below. But lasting knee health comes from a body that works as a coordinated system.

The Threshold Nobody Talks About

Here’s something I wish more people understood: your pain threshold isn’t fixed. It toggles up and down based on the aggregate of everything happening in your life. Sleep, work stress, total activity volume, even the emotional weight you’re carrying.

A knee that handled a five-mile hike last month can flare up doing a basic lunge this week. That doesn’t mean you damaged something. It means your capacity temporarily dropped below what you demanded. The distinction matters because the fix is different. Damage needs rest and maybe treatment. Reduced capacity needs gradual, smart loading.

One of our coaching clients, Josh O., asked me about “slow burn” knee injuries, the kind where pain appears without any obvious cause. This is almost always a threshold issue. The basics of managing it are being conservative with volume and intensity as a default, and cutting back further when the rest of your life is ramping up. It sounds simple. It’s also the thing almost nobody does.

The Range That Catches

If you’ve got osteoarthritis or a knee that clicks and catches at certain angles, here’s a technique that works well: find the arc of motion where it happens, usually about ten degrees, and deliberately load everything above and below that range.

For example, if your knee catches at roughly 90 degrees of flexion: work from standing down to just above that point for one set. Then squat past it (you may get a catch dropping through) and work from your deepest comfortable position back up to just below where it catches.

You’re building capacity and tolerance around the problem range without grinding through it. I’ve used this approach with patients and coaching clients for years, and it works especially well at both the knee and the shoulder.

Three Things That Actually Build Knee Capacity

Coordination First, Isolation Later

When people ask me about strengthening a specific muscle around the knee, like the VMO, I redirect them. It’s rarely about one muscle. It’s about how the quads, hamstrings, and calves work together.

The range that matters most for knee health is the first 30 degrees of flexion, from straight to slightly bent. Think of the position you’d be in right about to take off to run or jump. In that position, your entire lower body coordinates to distribute force, rather than dumping it all on one structure.

Coaching client Andrea B. asked about strengthening her knees for flexion with rotation, a position where she’d been hurt before. The answer wasn’t to avoid that position forever. It was to accumulate time there gradually. Dedicate a chunk of your training to those specific positions for a few weeks. Build up slowly. The joint adapts to what you ask of it, as long as you ask politely.

Progressive Exposure, Not Avoidance

There are two bad options for knee pain. One is pushing through everything because you’re tough and pain is weakness. The other is avoiding anything that could possibly stress the joint, wrapping your knees in cotton wool and never squatting below 45 degrees again.

The useful middle: expose your knees to movement in different planes, at loads you can control, and build from there. Your knees need to experience rotation, lateral movement, and impact in a controlled, gradual way. Avoiding those things is how you create the fragile knee you’re afraid of having.

Train the System, Not Just the Joint

Hip mobility, ankle mobility, and lower-leg strength all feed into whether your knee can do its job. If you only train the knee in isolation, you fix the symptom and ignore the cause. I’ll get specific about this in the full-body section below.

Build Your Mobility Foundation

Knee health starts with better movement. Our free 15-minute Mobility Boost routine is a great place to start building the hip and ankle mobility your knees depend on.

A Routine for Building Stronger Knees

These four exercises aren’t a workout. They’re practice. The goal is to introduce your knees to positions and loads they’re not used to, gradually, so they build tolerance and control.

Go slowly. Don’t push through pain. Your comfortable range will expand as your capacity builds. That’s the process.

Knee Circles

This one builds joint position awareness and teaches your knees to tolerate rotational forces. Start with your feet together in a shallow squat and make small circles. Both directions, slow and controlled. If that feels fine, gradually squat a bit deeper and repeat.

Then widen your feet to shoulder width and repeat. Next, step one leg out to the side and do rotations on the bent leg. Finish with a lunge position, rotating the front knee. Play with depth and the size of your circles. The point isn’t to push range. It’s to explore it.

Star Pattern Step Knee Bends

This one trains knee control during movement. Stand with feet shoulder width apart. Slide one foot forward along the ground as you bend the other knee. Stand back up, then slide the foot out at 45 degrees. Keep working around the clock, stepping further to the side and behind you.

Repeat on the other side. You’re teaching your knee to track well while the rest of your body is in motion, which is what actually happens in real life.

Front Scale Quarter Circle

The front scale builds balance and coordination with a straight base leg, which is important for knee health because it teaches you to control your position when things get precarious. Stand on one leg, raise the other in front of you with both knees straight, and rotate the lifted leg outward.

Don’t worry about height or range. Work with what you’ve got.

Jump Landing With Control

This adds impact, which your knees need to learn to absorb. Start with a basic broad jump, but keep it short and focus on landing softly with bent knees. Balls of your feet first, then settle.

Once that feels solid, try jumping on a diagonal, or on one leg. Keep your jumps short enough that you land in control. If you’re stumbling, you’ve gone too far. Gradually increase distance and depth as your confidence builds.

Single-Leg Stability: The Next Layer

Once your knees can handle these positions on two feet, the next layer is doing it on one. Single-leg work loads the knee through balance, proprioception, and coordinated muscular control in a way that bilateral exercises can’t match.

Ryan walks through three progressions here: the Patrick isometric hold (a loaded single-leg stance with eyes-closed progressions), front-to-back scales (dynamic weight shifts on a locked-out base leg), and single-leg hops with controlled landings.

The eyes-closed progressions are where it gets interesting. You’ll probably fall out of position immediately. That’s the point. You’re building the neurological wiring that keeps your knee stable when the ground shifts or you land at an angle you didn’t expect.

Why Knee Exercises Aren’t Enough

The routine above will help. But the people who actually get their knees back, the ones who go from “I can’t squat” to hiking, running, skiing, and playing sports again, they didn’t get there from knee circles alone.

They got there from full-body training that taught their hips, ankles, and everything in between to work as a system. That’s what we built Elements to do.

Here’s what some of our clients have said:

“I entered Elements with severe arthritis in my left knee and a reconstructed ACL in the same knee. My knee has regained full movement so I can squat properly. And I have gained more control and strength in movements for my martial arts training.”
— Christian K.

“Two bad knees, 60 years old, looking to stay active. I’ve been doing this for three years and can now hike, bike, ski, and climb when I could do none of those things before. You have to put in the work and stay consistent, but you will experience real improvement.”
— Adam B.

“My knees hurt and I could no longer squat. I have regularly worked my way through Elements, slowly, and it is now a stable part of my morning routine. I can move in ways I wasn’t able to.”
— Lana M.

“Having recovered from a motorbike crash where I hyperextended and dislocated both my knees, my knees are now finally pain free and more mobile than actually before the crash.”
— Simon B.

Elements includes a Gradual Track that scales the loading for knees that need a more conservative starting point. Same movements, same progression, paced for where you are. You build into the full program as your capacity grows.

Elements

Practice essential movements for practical physical fitness

Already Training With Us?

If you’re already a client and want targeted knee work, we built All You Knee’d Is Load, a focused knee program based on workshops I developed for our coaching clients. It’s available through the All-In membership.

And if you’re curious about whether squatting is actually bad for your knees (spoiler: it isn’t, with the right preparation), we cover that in detail separately.