This is a really good article.
http://www.vox.com/2016/6/29/12051520/exercise-weight-loss-myth-burn-calories-video


"You work hard on that machine for an hour, and that work can be erased with five minutes of eating afterward," Hall says. A single slice of pizza, for example, could undo the benefit of an hour's workout. So could a cafe mocha or an ice cream cone.