Ran the calculations some time ago, and donating a half liter of blood gets rid of about 500kcal, which I can easily manage to do in under half hour not counting the paperwork. I think the only more calorie-consuming activity I can think of is liposuction or mutilation of body parts. Not that I recommend either, just a random thought.

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[–] BironyPoisoned@hexbear.net 1 points 4 days ago* (last edited 4 days ago)

10 min / mile for 30 minutes with average male body weight will easily burn 400 calories, it'll depend on how much you weigh of course. Any moderate intensity cardio will give you similar results.

It might take you a few months to work up to that speed / distance but it's very do-able.