Each of us tends to “be the average” of the five people we spend the most time with.

“If you spend time with others who don’t pay much attention to their health, don’t make the best choices, and choose to let their bodies go — then it will be easier for you to ‘fall off the wagon.'” — Jim Burdemy, a holistic health and fitness coach with Elite Core Fitness in King of Prussia, Pennsylvania

Related: Before You Buy Those Fitness Trackers