Workout is one of the best exercises for weight loss — and for good reason.

Every year, at least 2.8 million people die due complications related to excess weight
I'm going to make you work hard," a blonde and perfectly muscled fitness instructor screamed at me in a recent spinning class, "so you can have that second drink at happy hour!"

At the end of the 45-minute workout, my body was dripping with sweat. I felt like I'd worked really, really hard. And according to my bike, I had burned more than 700 calories. Surely I had earned an extra margarita.