Here is just a quick note on New Year’s Resolutions ("nyr"). Some massive percentage of nyrs are broken by the end of January, so my basic advice is don't make any. Making yourself promises that you are almost certainly going to fail at is only going to make you feel guilty, which isn't helpful. I am generally against making promises that you know in advance you won’t be able to keep to, but that's a different story.
There is a trick I learned a long time ago that is related to how I feel about nyrs. The trick is this: when you are faced with a binary choice that you are not sure about, flip a coin. But instead of doing what the coin decides you pay close attention to your reaction. Sometimes you do care whether you have eggs or pancakes, and it’s easier to tell in reaction to being told which to have.
And in that theme I would encourage you to think about what kind of resolutions you are inclined to make and see if they shine a light on how you feel about where yourself and your life is heading.
Making one melodramatic (and probably drunken) promise to yourself almost certainly isn't going to get you to go to the gym twice a week. But thinking about what it is you really want out of going twice a week might tell you something about yourself.
However, if you have goals, and you want to use the event of New Years to help, here is a tip from TED: