Best Exercises for
Bad Knees

Bad knees stop more people from training than almost any other limitation. And the advice most people get — "just rest" or "avoid squatting forever" — is wrong in both directions. Most knee pain in adults over 40 is manageable with the right exercise selection. Here is what actually works.

What Causes Most Knee Pain in Lifters Over 40

Weak quads. The quadriceps support the knee joint. When they are underdeveloped, the knee takes more impact stress than it should on every step, every stair, every landing. Strengthening the quads is the single most evidence-backed intervention for knee pain — including for osteoarthritis.

Tight hip flexors and IT band. Poor hip mobility pulls the knee out of alignment during movement. Stretching and mobilizing the hips often reduces knee pain that has nothing wrong with the knee itself.

Poor movement patterns. Knees caving inward on a squat or lunge puts shear force through the joint that it was not designed to handle. Fix the pattern and the pain often follows.

The Best Exercises for Knee Pain (Ranked by Safety)

1. Terminal Knee Extension (TKE)
Anchor a resistance band around something solid at knee height. Face away from the anchor, loop the band behind your knee, and gently straighten the leg fully. This isolates the VMO — the teardrop muscle on the inner quad — which is almost always weak in people with knee pain. Do 3 sets of 15-20 reps. This is the first exercise I give every client with knee issues.

2. Leg Press (feet high on platform)
Placing your feet higher on the leg press platform reduces knee flexion and shifts the load to the glutes and hamstrings rather than the knee itself. Start with very light weight, full range of motion you can control, and build from there. This is far safer than a barbell squat for most knee problems.

3. Box Squat
Squatting to a box removes the bottom range of motion where knee stress peaks. Set the box so you are squatting to parallel or just above. Sit back and down rather than forward. This rebuilds squatting mechanics safely without excessive knee stress.

4. Romanian Deadlift
The RDL keeps the knees soft and slightly bent throughout — it is a hip hinge, not a squat. It builds the hamstrings and glutes without loading the knee joint significantly. Arguably the best lower body exercise for people with knee issues.

5. Hip Thrust or Glute Bridge
The knees stay relatively fixed in both movements. They build the glutes directly, which support the knee through improved hip stability. Even severe knee pain sufferers can usually do hip thrusts pain-free.

6. Step-Up (shallow step)
Step up onto a low box or stair — 4-6 inches to start. This is controlled single-leg loading that builds quad strength without the compression of a full squat. Progress the step height gradually as strength and comfort improve.

What to Avoid (Until Pain Resolves)

Deep squats with load. Not forever — but full-depth barbell squatting with significant weight is not the starting point for knee pain recovery.

Running or jumping. Impact is not the enemy of knees in general, but it is a poor starting point when pain is active. Build the supporting structures first.

Leg extension machine. The terminal arc of the leg extension machine puts significant shear force on the knee. TKEs with a band are a safer alternative for isolated quad work.

One Thing to Do Today

Do 3 sets of 15 terminal knee extensions with a light band. Then do 3 sets of 15 glute bridges. That is 10 minutes of work that directly addresses the two most common physical causes of knee pain in adults. Do it for 3 weeks before concluding it is not working.