Chalk it up
I have been playing volleyball. You can tell from the chalk dust on my trainers:

I also have a volleyball injury, which is quite exciting - I've never had a sporting injury before. My right index finger is OK most of the time but every time I play I inevitably jar it at some point, and it hurts like buggery and carries on being painful for a few hours and feels sort of weak and damaged. Which is slightly worrying - I have no idea if it is actually worrying or not - and rather painful... but gosh, a sporting injury, how cool is that?
I also have an attractively-bruised graze on my leg where I fell over my own feet today. But shhh, don't tell anyone.