I spent Saturday at Antur Steiniog and did about 14 runs. I haven’t been on my bike much this year but apart from a few aches and pains thought I’d got away with it!
However, when I tried to ride at CyB on Sunday I found I couldn’t push down with my left leg…my knee feels weirdly weak.
It’d not sore walking or standing, but I can’t push up from a squat with it, stairs are a little awkward if I try and run up them.
There is no swelling and I didn’t fall on it.
It doesn’t even hurt that much when I do try and pedal, there is just a feeling that if I really push then it will hurt a lot.

I’ve never had anything like this before, I’m guessing I’ve stressed it with so much downhilling (it’s my ‘back’ leg when standing on the bike BTW) but have no idea if it’s serious or not..

Any ideas?..beyond asking a doctor of course