Well, Y's and gyms love those New Year's resolutions. They always see a big bump up of people joining up. I would suspect trendy workout clothing boutiques get a surge of new customers too.
How about something different this year? Make the changes, or continue with the great changes you've already made, today, Dec 23, or tomorrow Dec 24, or whatever day you happen to read this post. Even Christmas day. Don't wait for Jan 1st and another New Year's resolution that'll peeter out in a couple of weeks. During the holidays is the best time to give yourself a gift of healthy living, and to unwrap that gift early, and start using it now. Everyone around you will benefit from a healthier you.
BTW - you don't need to go to the Y or a gym to work out. There are plenty of exercises you can do with minimal equipment (ie. medicine ball, exercise ball, dumbells) or no equipment at all. Walking is one of them, but if you are pressed for time, you can replace a half hour of walking with about 10 minutes of exercises that will also increase your strength and flexibility unlike walking will. Search on youtube.com for easy to follow videos for all levels you can follow in your pajamas (if you prefer.)
Not to be a complete killjoy, but the holidays are a great time to watch what you eat. It's so easy to put on 5-10 lbs between Christmas and New Years, especially when you add in all those Christmas parties, and the cake and candy that mysteriously shows up around this time. Beware the popcorn variety tin that's so easy to binge on.
Have a healthy and happy holidays. Why not?