Bicycling, hiking, or cross-country skiing on my days off. Hit the gym for 45 min to an hour every day that I go to work. Am no lightweight, but I try to stay reasonably fit for a guy in his 50's. Got pretty banged up a couple of years ago and after surgery I gained some weight, just sitting around. Have lost a bit of it, and have regained most of my endurance & strength.
Beer is a fat-builder in a big way. I like it too - but limit myself to just a few glasses per week. Find something else to do in the evening instead of hanging around, drinking beer. Walk, get that dog, go to the gym, something... Almost anything as long as ya stay active! Shudder the thought, but I often make myself take the pedal-type bike out instead of the Triumph...
Guy