What other Hobbies or Interests Do You Have?

Yes I have another Hobby but it carries a dirty little secret
I do part time DJ' ing but have to connect up to some pretty lousy pre installed Amps and Speakers.
My dirty little secret is I try all sorts tweaks and workarounds to get the best possible sound without the dancers realizing
I say on average only 3-5% of dancers will notice the difference between
a mediocre sounding track and one thats been enhanced by software or hardware tweaks

Great thread! Diverse crowd, but with certain themes recurring! My love of music and audio equipment comes from my parents, who always had a stereo system, and lots of LPs spinning. 
As for me... I’ve been lifting weights for 41 years straight, and have been competing in bench press competitions since I was 31 (I’m 54 now). I have my own home gym where I mostly powerlift, and my sons, and my grandkids, join me whenever they’re over. 
Speaking of grandkids, is being a grandfather a hobby? If so, that’s my number one! I also love grilling all year on my Weber kettles. Big family, so plenty of grill time all summer by the pool. 
I have a 2015 competition orange mustang GT premium with the “50 Years” package. I’ve had a thing for mustangs since I was six! I’m not a mechanic, but I can detail like crazy!

I also keep aquariums. Big oddball fish interest me. My favorite is my silver arowana. Close second is my datnoid. We’re getting a 300 gallon tank for them this year. 
My wife is very patient with my audio hobby, so I’m sure to remember to ask her what she feels like hearing each night. We have a main system, a bedroom system, a family room system, and a vintage system in my weight room! As well as a system in the shed which plays outdoor speakers aimed at the pool area. There’s almost always music playing around the house. And I make sure it sounds good!

Keep it coming!!

Classic car collector.
Guitar builder.
Beekeeper.

vivisection...mummification...alien communications...petty larceny

OK, none of that is true. The truth is so boring:

1 - I walk 5 miles a day as fast as possible. Ran that or more for decades; now it's walking. Used to swim 2-3 miles/day (that was then).

2 - Music every waking hour: usually streaming classical interspersed with headphone audio of many different genres (I have 7 headphone amps and 8 or 9 headphones...it's not a passing phase)

3 - Streaming video content (4K blu rays & Netflix) on a huge OLED TV. I've always been a fan on high quality visual narrative, and we are the new golden age of that

4 - And writing...anything & everything. I make my living as a writer, but even when there's no work, I write for other reasons. It' what rat psychologists call "consumatory behavior" (ie, do it because it feels good)

Hobbies that I've enjoyed over the years have included audio (since about age 14), motorcycles, mostly dirt bikes, photography (film), hunting, shooting, flyfishing, woodworking, have always read, but never thought of it as a hobby, probably most seriously for the last 20 years my family genealogy, and collecting American art pottery, both antique and new. Oh, and lastly, run-on sentences.
L.