You can still work your brain. Not just by catching up on your reading and that sort of thing, but by riding in your mind. And it’s not just mental games — it really does improve your riding. I learned this the last time I got hurt.
I wanted to work on cornering, so I read everything I could get my hands on and more about proper cornering technique and watched a bunch of videos. Then I spent a lot of downtime riding corners in my mind. Lo and behold, when I got back on the bike, my turns were smoother and faster. No joke.
Here’s some guidance on how to do it.