ok, just don't be like all the other NY resolutioners at the gym: Go to gym to burn calories, spend 10 minutes circling the lot for a close parking spot.
urban active has a room where you can watch movies and jog/eliptical/bicycle/stair climb/yoga ... its $30 a month and it gets my heart rate up without having to freeze my ass off in the cold (hate the cold unless i'm snowboarding... then its tolerable). I basically only exercise so that I can not have to buy a new wardrobe, and so that I can hike when it gets warm out, so whatever I do has to entertain me enough to keep on it. The theater seems to be doing it for me for now.
speaking of new years resolutions, I was pleasantly surprised to find the gym was pretty empty yesterday. When do all the resolutioners start going to the gym?
how socially awkward are you? You could start events on here, then meet people, and if you don't suck too much, you might make some friends who introduce you to other people. You could always volunteer! That's free.