If there is a gym close to you, I recommend rock climbing if you are looking for something both mentally and physically stimulating. It’s like solving a puzzle (figuring out how to do the climb) and then executing by having the strength and technique to do it. It’s an absolute blast. Been doing it for a couple years and it brings me a lot of happiness. Plus the community is so open and welcoming! Slowly all my friends have become people I’ve met from those communities.