Here is an interesting study regarding energy consumption 
<a href="http:&#x2F;&#x2F;www.cell.com&#x2F;current-biology&#x2F;abstract&#x2F;S0960-9822(15)01577-8?_returnURL=http%3A%2F%2Flinkinghub.elsevier.com%2Fretrieve%2Fpii%2FS0960982215015778%3Fshowall%3Dtrue" rel="nofollow">http:&#x2F;&#x2F;www.cell.com&#x2F;current-biology&#x2F;abstract&#x2F;S0960-9822(15)0...</a>
Tldr days of high level of exercise does not linearly correlate to high level of energy usage. The body can somewhere(brain?) spend less energi to compensate the exercise.