Knees collapsing inward under load (valgus) is extremely common, especially as fatigue sets in. It usually isn't a knee problem at all — it's a hip and foot problem.

The three usual causes

  • Weak or under-active glute medius
  • Feet that collapse inward (loss of arch)
  • Simply moving too fast to control the descent

The fixes

  • Cue 'spread the floor' — screw your feet outward
  • Add banded lateral work to wake up the glutes
  • Slow the eccentric so you can steer the knee

OurFit watches for valgus on both sides independently and shows you the exact rep where it appeared.