AOL: Your Free Walking Plan To Lose Weight and Burn More Fat After 50 Walking may be the most underrated workout out there. It's free, requires nothing beyond a good pair of shoes and can happen almost anywhere. But can it actually help you lose weight?

Understanding the Context

According to ... Your Free Walking Plan To Lose Weight and Burn More Fat After 50 I had always understood 'there's no such thing as a free lunch' as a expression to demonstrate the economics concept of opportunity cost - whereby even if the lunch is fully paid for, one loses the opportunity to spend that time doing anything else.