Using the equation for walking cost, you’d find that an average 150-pound person burns 54 kilocalories to walk a mile (0.36 × 150 = 54). A smaller person, at 100 pounds, would burn 36 kcal. (These are the costs above and beyond the costs of resting, which we’ll discuss below.) If we want to factor in the effort to carry a backpack or a baby, we just add the weight of those items to the “Weight”
