I've learned to hate the way my body feels when it's out of shape, and avoiding that feeling is my main driving force. I'll never get big muscles if that is my goal, but modern society doesn't really need big muscles, so I'm fine with just feeling comfortable with myself again. You have to first achieve that feeling before you know how much it's worth fighting for though.
I just took a 2 month break from lifting, mostly because of the holidays and work being hella stressful to the point I just wanted to go home and vegetate rather than spend another 1.5 hours working out.
And yeah. At first it was like "This is kinda nice! Not being tight and tired all the time, not having to keep a schedule to maintain my workouts." That was the first two weeks.
But after those 2 weeks, I started noticing all sorts of stuff. My posture started regressing, to the point I ended up with a sore right trap and honestly pain along the whole of my back on the right side, from too many hours spent in my gaming chair and not enough hours correcting those bad postural positions.
Joints around the legs, particularly around my knees, started to get tight.
I started feeling unpleasantly full a lot of the time, despite no real change in calories. It's like when I wasn't burning off half of what I ate, the remainder just sat there doing....nothing.
I started becoming severely demotivated and even depressed.
And once the feeling of "tone" for lack of a better term wore off.....I seriously started questioning if I ever really lifted. I felt loose and soft and weak.
Once you start working out, and build a little bit of muscle....it's kind of amazing how fast the body will "Nope" right back to its resting averages for things like muscle when you just stop working out. I think the current broscience is after about 1 week of not lifting, your body starts dropping muscle mass since it doesn't think you need it as much anymore.
Just got back in to the gym yesterday, and while I'm incredibly sore....I also feel more upbeat than I have in weeks. I love the feeling of having been "worked", the next day when you may or may not be sore but your muscles have some tension and feel like they're ready to "stuff."
Just a bit of shameless self-promotion too, but there is
a dedicated fitness thread if people want to use it. Mostly it's just me quasi-documenting the last few years of going from complete slob --> someone who cares a lot about working out.