How do I increase IQ?

I was inspired by Jordan Peterson here. He says that IQ peaks at 22 - 23, and the best way to regulate that is physical exercise (both cardio and lifting). I'm interested to know what other ways we can increase, or regulate IQ.

For example, I play chess against myself. I just keep a game going in my living room, and make a move whenever I walk through the room.

Jordan's video: https://www.youtube.com/watch?v=IHZV8Juna40