I've always been "in to it". I started actually working out when I was about 16 years old. In about 2 years, I got up to about 230 lbs and a little over 19% body fat. At that point, I unfortunately fell into a pretty bad spell of body dysmorphia and ended up cutting all the way down to 150 pounds (at 6'2'', you can imagine how that looked). I quit working out "seriously" for a few years and was always afraid of getting fat.
Thankfully, I recently overcame my personal issues and made the decision to get back at it. I'm currently sitting at around 165 lbs and a little over 10% body fat. I'm honestly really only doing this as a means of holding myself accountable.
I know it's cliche, but it's just like I'm in my own world when I'm working out. I put in my headphones, put my head down, and lift weights. The poetic feeling of bettering yourself physically and mentally is just beautiful to me. I'm not that guy that goes in to the gym, stands in front of the mirror, slams weights, screams, grunts, continuously looks around for attention, etc. I go in just for me, to do what I enjoy and what relaxes me.