As so many people do, I'm making a resolution to "get more fit" and "lose weight." Losing weight is an easy one to quantify. I'm starting the year at one weight; I'm going to finish it at a lower one. Right now, I'm keeping that goal fairly simple: lose 12 pounds. Great! One pound a month! Surely I can do that! If I meet with great success, I can set a new goal! Getting more fit has seemed like the more difficult one to define, though. Losing weight alone is not a definite sign. I know very slender people who struggle with activities that people twice their size handle with minimal to no difficulty.