What is a niche hobby of yours that you are fascinated by and would like to share with others?
I'll start. I have recently gotten into 3D printing, and, while incredibly frustrating sometimes, there's nothing more rewarding than getting a perfect print.
YouTube! If you look up 'beginner Qi Gong' or 'beginner Tai Chi', you'll find a lot of great 10-20 minute routines. I like George Thompson's videos. He trained in the Wudang mountains where tai chi originated.