Looking for some motivating words to get those New Year's resolutions going? All of these titles offer guidance, whether you want to work out more, eat smarter or simply be a happier, healthier person in 2015.

When you visit your doctor for a physical, it's likely that your exam will include a calculation of your body mass index, or BMI. It's also likely that your doctor will use the resulting score to assess your weight status and related health risks. But BMI is simply a measure of weight in...