I am currently trying to lose ten lbs, and was not doing so well, until a few minutes ago I hopped on the scale, and it turns out I've lost 20. That's down significantly more than 10 lbs from when I weighed in before I worked out. I didn't workout very hard, but today was something of a fast day. I allowed myself no extra snacks, no food other than strict meals. I drank 64 oz of water. This was probably at my peak calorie burning time. How did my weight do this? I assume I will gain it back in a few days, if not already. (I ate dinner afterwards, and can feel my stomach swell.) I am only 17, so its possible that my metabolism is unsteady, although my weight generally is pretty stable.I was actually at plateau the last few weeks. I am positive it's not the scale, my parents say it works consistently for them, as does my sister.
As noted by the comments from @Eric Kaufman and @Sean Duggan, losing that kind of weight in an hour is likely not possible and certainly not safe. By comparison, I weight close to 220 lbs and will lost 2 lbs through persperation after one hour high-intensity exercise. I did lose close to 7 pounds once, but that was due to taking a purgative in preparation for a colonoscopy...
The weight loss that you see is therefore probably an artefact:
- Per @Sean Duggan ensure that you are wearing the same/similar clothes at each weigh-in.
- Regardless of the opinion of others, your scale may not be working properly. Try re-taring it. Ensure that it is level. And try a different scale.