Getting to the gym can be addictive. It starts out where you dread to go, then get frustrated because your body doesn't change over night and you quit. Then you start up again, maybe start seeing results and keep going.
I started out back in 1987 at 6'0' and 170 lbs. My goal was to get to 185. I was going with a friend that was a collegiate powerlifter. We were stationed in Guantanamo Bay, Cuba and the gym wasn't really good. No Hammer Strength stuff, just old "Universal" crap and free weights.
I didn't see results after a couple weeks and quit.
He talked me into getting started again and I did. At first I lost weight and then started putting on muscle. A Navy guy started joining us and this new guy started on the juice. We watched him put on 30 pounds in about 6 months. It was good solid mass and I was tempted to try the stuff seeing how well it worked. He started selling it to other guys and he went home on leave, went down to Mexico and bought a supply, and got busted coming back to base on the flight from Norfolk to GTMO. He spent some time in the brig and was awarded a Dishonorable Discharge.
After Gitmo I was stationed in Camp LeJuene, NC. I went TAD to Homestead AFB and the gym on the Air Force Base was crappy, so my parter and I joined a gym off base. It was a huge roid gym and you could watch guys pop pills and shoot up right in the gym. I met a guy that got gynocomastia (man boobs) from steroids and I never again was tempted to try the shit. Besides, I've been subject to a piss test since 1987.
I've been working out for 22 years. I have cycles when I put on weight, the most I've been is 235. I felt so fat, my pants were tight, my cheeks were chubby, etc. I've been at 217-220 for about 6 years now. I'm at probably the biggest I can ever get naturally. When I graduated from the academy I was at 205, so 15 lbs in 17 years isn't bad. I could easily lean out back to 205 or so, but when I lean out I lose power.
If you can stick with an exercise program you like, it becomes a habit. I've had this habit so long that I can't quit. If I miss a day I feel like crap.