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How fast does your body build muscle?

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My scale says that I picked up 3kg's over the past week or so. I've been eating healthier and have been getting a LOT more exercise. 8 hours of rigourous caving on sunday. Now is this possibly weight or muscle and is it even possible to put on 3 kg's (which is a hell of a lot) in about a week? My clothes don't feel as tight, but it could be my imagination. Or maybe I need a new scale. (for those of you working in pounds it's 3 X2.2 pounds)