You shouldnt have to think about it, just do it, you have so many options, the treadmill, the crosstrainer, row machine, dont be scared to put some effort in you may lose weight and look better.
cardio is good for the heart, detoxed the body, keeps fat at bay..and loses it if you do it properly and consistently..why would u wanna be fat, chubby, that sign of weakness, dont let yourself go, im seeing guys in there early 20's with guts, makes me sick..and also pick one thing in your diet that u know is bad for u and quit it...i did, i quit whitebread, 2 weeks later i look leaner and the pussy magnet is on max.
moral of the story is do cardio please.