I've rapidly increased my running endurance this year. For the last years I was running max 12 km, in this year I've broken half marathon, and I've started trail running. After one run with 600 meter elevation, I've got some clicking sounds in knees next day (without any pain) which I interpret as warning signal.
Running uphill was perfectly comfortable (thought exhausting), but running downhill was a struggle with gravity that accelerated me to move legs much faster I'm used to. I suppose also it was an overwhelming experience for muscles stabilizing my knees.
What exercises can I use to strenghten that muscles and prepare them for the downhill shock? Interval sprints to make them prepared for higher velocities? Thinks like vew-do?