Perfecting the 'calories in, calories out' strategy to get fit - CNN

Nailing down calorie burn is harder than you may think. The number of calories a person burns doing an exercise depends on various factors. But if people don't know how many calories they are burning, how can they come up with a fitness plan? Experts weigh in.

(CNN)Forty-five percent of the world's population is trying to shed a few pounds, according to a 2020 Ipsos poll. And they prefer to do it by exercising more and eating better, not by dieting. That's… [+5426 chars]

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