Summer is ending , Fall is approaching . . . I feel this is a good read on how to stick to your good habits and keep that summer bod of yours in check throughout the Winter months!

Katy Milkman played tennis at Princeton, and when she finished college, she went to the gym every day. But when she started grad school, her fitness routine went south.

"At the end of a long day of classes, I was exhausted," Milkman says. "Frankly, the last thing I wanted to do was drag myself to the gym. What I really wanted to do was watch TV or read Harry Potter."