Knee Pain — 3 Causes & 3 Fixes

If your knees hurt more than they used to, it's not just age. It's one of these three things — and all of them are fixable.
Source reel · @thekneedoctor
💡 The premise: Knee pain gets blamed on age, but it's almost always mechanical — a weak muscle, a stiff joint, a tracking issue. Fix the mechanics and the pain drops. This guide walks through the three most common culprits and the specific drill for each.
Cause 1 — Weak VMO

⚠ A weak VMO — that inner teardrop muscle just above your knee.

When the VMO is weak, your knee cap gets pulled off track under load. That alone adds 30% more pressure to the outside of your knee — the spot that usually hurts.

The fix: Short Arc Quad Extension

Short Arc Quad Extension — 3×15

Short Arc Quad Extension
Frame from source reel
  1. Roll a towel under your knee for a slight bend — that's the arc
  2. Extend the knee against gravity, pause at the top for 2 seconds
  3. Lower slowly — the lowering is where the VMO gets worked
  4. 3 sets of 15, daily. Light or bodyweight; this isn't about load
Cause 2 — Weak Glute Medius

⚠ Weak glutes, specifically the glute medius.

The glute medius controls your hip. When it's weak, your knee caves inward to compensate on every step and every rep — that inward collapse is a direct line to knee pain.

The fix: Banded Lateral Walk

Banded Lateral Walk — before every leg day

Banded Lateral Walk
Frame from source reel
  1. Band around your ankles or just above — tension matters, not position
  2. Slight athletic stance, knees soft, weight on the mid-foot
  3. Step sideways, keeping the band under tension the whole time
  4. 10 steps each direction. Do it before every leg session
Cause 3 — Stiff Ankles

⚠ Stiff ankles — if your ankle can't bend forward far enough, your knee twists to make up the difference.

That's every squat and every set of stairs. The ankle is the joint that takes the load first; when it's stuck, the knee inherits the problem.

The fix: Wall Ankle Rocks

Wall Ankle Rocks — 10 reps each side, daily

Wall Ankle Rocks
Frame from source reel
  1. Stand facing a wall, toes about 4 inches out
  2. Drive your knee toward the wall without your heel lifting
  3. Go as far as you can, hold 2 seconds, return
  4. 10 reps each side. This one can be done every single day
The Bottom Line

None of that is age, and it's all fixable. The pattern is the same every time: a weak muscle or a stiff joint somewhere in the chain, and the knee pays for it.

Three things to check, three drills to run:

  • VMO weak? → Short arc quad extension, 3×15 daily
  • Glute medius weak? → Banded lateral walk, before every leg day
  • Ankles stiff? → Wall ankle rocks, 10 reps each side, daily

Save this before your next leg day, and send it to someone who keeps blaming their knees on getting old.