A prime example is my remodeling of my house. I enjoy it for many reasons. It is fun, not work. Something very different than my work which involves no physical labor. I'm learning a lot about engineering first hand that I did not learn by the book in engineering school. In previous generations, this would have been part of the work for the males in the household.

An easier example is probably my bike riding. I spend hours on many weekends and after work riding my bike. It is recreation and exercise. There is little practical purpose for me to ride 35 miles to get a beer at the Old Dominion brew pub. The point is that bike riding is fun. In previous times, bikes were primarily transportation. But now that technology has mainly be replaced by the car. This allows the bike to be used as a pastime.

So if you are looking for a new hobby, look in the past. You'll find a pastime there.