Same here, and the last time I used a firearm was in 7th grade agronomy class in North Dakota.

And by that, I mean we were taught to use rifles, not that I used a firearm ON my class.

Same here. Especially after spending 8h clicking mouse on not very ergonomic office table. I also notice a lot of people (especially younger males) have one shoulder a bit higher/lower than the other. I can only speculate it's for the same reason.

Likewise, and for as long as I remember. I've always just attributed it having my right arm under more conscious and thus less unconscious control.

My left arm also swings more and I attribute this to carrying a backpack for a long time on my right shoulder and holding the backpack with right hand.

So you have Parkinson's?