"You can't out-exercise a bad diet."

as you get fitter, then you need to work harder to burn the same amount of calories, but CiCo still applies

a person that is obese will burn more calories doing the same walk for example than someone that is fit, but as that obese person gets fitter, they will need to work harder, just like if the fit person was to get fatter, then the exercise that they did when they were fit, they will burn more calories