7. Be Kind to Yourself There will be days when motivation is low, and that's okay. Don't be too hard on yourself if you miss a workout or indulge in an unhealthy meal. Fitness is a journey ...

(She’s also author of No Sweat: How the Simple Science of Motivation Can Bring You a Lifetime of Fitness.) Too often, she says, people begin exercise programs to lose weight, and quit when they ...