Dads: How do you find new hobbies and friends?

I'm a dad of a toddler, married, in my early 30s. Lately, I've felt like all I do is work and take care of the baby.

My longtime friends all have kids and live at least 20 miles away and we get together less and less. I'm a gym rat but have gone alone for a decade. Nobody seems to share any of my interests (lifting, biking, kayaking, anything active or not having to do with gaming/sports).

I don't know where to even begin to find new pals or join new social groups. My wife is encouraging it. Help !