Honestly, the easiest way is to just stop eating.
I did some serious hard labor for a very long time. We're talking go home, eat a DiGiorno pizza and still lose weight shit. When I stopped doing that, it slowly started creeping on. So I just made my lunches smaller and smaller. Then when lunch became just a sandwich and I was still gaining weight, I cut out breakfast entirely. Then when I was still gaining weight with that, I cut out lunch too. Now I just eat dinner and honestly...it's just way fucking better. The beautiful thing about that is you literally can't eat enough to get fat. Your stomach shrinks because it's not being fed all day, so your one meal is naturally smaller. You're healthier, and you don't really have to do shit for it. I fucking suck at working out - I've never had to because of the job, so I just can't build that routine to do it. It's WAY fucking easier to just eat less, maintain my current activity level, and just lose the fat that way. If you've got a desk job, you may have to hit the gym a bit. But, really, just eat less.