Why it's tricky: We don't know how to give ourselves a break, even when we deserve it. In 2010, Americans neglected to take 424 million paid vacation days that were due to them.
Make it stick: This resolution is so vague, it basically sets you up for failure, says Norcross. In fact, it's pretty close to wishful thinking, which, as Norcross mentioned, has only a 4 percent chance of success. Find a strategy that helps you achieve your overall goal (for example, meditating more, drinking less, using your vacation days) and then figure out a way to measure it. One of Norcross' colleagues has taken this to heart: He's resolving to "sit less" this year, so he's tracking the percentage of computer time he spends sitting versus standing or using his laptop on the treadmill.