I don’t believe in making a New Year’s resolution: they tend to be too big, the timing is too arbitrary and the dead of winter is not a great time to take on anything that requires a high level of motivation.
I prefer mini goals, very small and manageable habit changes, that are ongoing. All year long! There are many great books and websites about this topic. I like the idea as championed by Dr. BJ Fogg: http://tinyhabits.com/join/ (it is free). He also has a TED talk: https://www.youtube.com/watch?v=AdKUJxjn-R8
For example, I had a tiny goal of doing 2 sun salutations every day. I still do this most days, unless my fibromyalgia is really bad. 2 is easy, if I feel like doing more I can, but I know I’m only committed to doing 2. It is enough to warm up my muscles and get a good stretch, and I feel like I’ve accomplished something. Phew! Doable! If that is a word. I have a daily meditation practice, maintained by keeping sessions short, 10-20 minutes. Good enough!
Keep your goals small and reasonable, and celebrate each little victory. I also recommend reading The Willpower Instinct by Kelly McGonigal, and Better Than Before by Gretchen Rubin.
Aim low, people!