Just wondering how to fix my knees quickly now that i've had my first awesome crash. They didn't seem too bad afterwards and I even kept riding for a while, the next day and two days later still it hurts to walk and I can't straighten my legs without pain.

I basically landed with them folded underneath me from quite high up and then the kite ripped me forwards with the board digging into the water as per the picture below.



Just wondering if anyone has some good physio exercises/drugs/etc they can recommend.