As one poster says, if we don't, we aren't growing. Good answer. But I've abandoned those typical "lose weight and get fit" generic resolutions. I've learned the more specific the resolution, the better.
For instance, last year I resolved to write 1000 words every day, five days a week, and stuck to it as much as possible. This past year, 2014, turned out to be my most productive writing year in a decade. I also resolved to walk an hour every day possible. I have and will continue both resolutions.
My new resolution for 2015 is to clear out my sewing room (it has become a Christmas gift-wrap, catch-all mess) and get back to sewing. I love sewing and miss it. I intend to take a quilting class this year at our local fabric store.
When you make resolutions, follow the guidelines for any goal setting. Make your goals specific and realistic. Don't set yourself up for failure with overly ambitious resolutions.
Good luck and happy 2015!