Great question — answering as the UphillTech team:
The amount of calories you need to burn to cover any given distance is the same regardless of whether you haul ass or you take a leisurely stroll (roughly 70-80 per km, depending on body weight). Properly, you burn more the slower you go, but that is because it takes longer and you have to spend extra calories on bodily functions not related to moving; but unless we are talking about time differences in the range of hours, the difference will be negligible. The extra weight of shin guards is also negligible. That said, soccer is physically harder that running a given distance at a steady pace, because soccer involves things that put a greater strain in the body, e.g., many accelerations to...
Full answer by Koldito: https://sports.stackexchange.com/a/12522 (CC BY-SA 3.0).
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