Sure, Americans might be more sedentary than ever, but that isn’t what impacts our growing waistlines, because exercise really doesn’t burn that many calories in general. In fact, when you compare Americans with an indigenous tribe of hunter-gatherers -- people who are on their feet all day -- there’s not much difference in calories burned per day.
In many cases, people think that they can simply out-exercise a bad diet, but the truth is much more complicated: processed foods and sugary drinks play a large role in weight gain (surprise!), along with a host of other lifestyle and genetic factors.
It’s also important to understand that if you’re overweight, it’s not necessarily because you’re physically lazy. Common sense has it backwards. People aren’t fat because they don’t exercise... people don’t exercise because they’re fat. If you were told that you could be Adrian Peterson for 24 hours, you’d be sprinting around like a puppy during its first time in the park. Conversely, if any self-proclaimed exercise lovers (p.s. I hate you) worked as hard as they do, only to find themselves looking like this guy, there's a good chance they’d throw in the towel.