Here is a great exercise to keep your mind and chops sharp. Mike Johnston of mikeslessons.com put this out and I really enjoyed the challenge. The goal is to play a single paradiddle over-and-over while reciting every other letter in the alphabet. It’s a lot harder than it sounds. I was able to do it at a slow-medium speed but need more practice time to speed it up. My goal is to post a new video here once I get comfortable with it. Try it!