Knee exercises

Root cause of it though is almost certainly my hip, an untreated injury in Taekwondo (felt like I ripped my groin open attempting a kick) means that something is 'impinging' (I took this to mean getting trapped) in the joint, it's not really a problem for me but it means the hip doesn't have full range of motion approx. 95%) and is generally a bit tight.

hip pain is classicly felt in the ipsilateral (same-sided) knee.

--d0cA