Would you find it funny for me to use a coloring book or puzzles, to help keep my mind challenged?

Not at all. Oftentimes people feel they need to "put away childish things" as adults and obviously this is true in a lot of ways but some things we do as children such as stimulate our minds and bodies more, even in seemingly simplistic ways, isn't something that needs to be stopped in my opinion. Lying in the floor with a coloring book might be the 'therapy' a lot of us need.

I have several coloring books and a big supply of colored pencils. I just bout a new variety puzzle book on Wednesday. 

Nope, I am addicted to puzzles. This post was edited by Bozette at May 5, 2017 8:53 AM MDT

I don't like to color but I love to do logic puzzles. But many adults do like to color, there are several adult coloring books out now.

I suggest Googling The Teaching Company and TED Talks.