Why do I gain weight after a workout?

For example, last night I did about a 400 calorie workout along with dieting so my weight should have gone down, however my weight went up by .4 of a pound, which doesn't make sense to me. Would my weight go down tomorrow or in a few days if I didn't work out? I heard its because of swollen muscle but not really sure what causes it.

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Recommended Answer:

it could also be your body is pumped up with more volume an fluids so it inflates u more making u feel heavier

Other Answers:

• It could be from a meal or drinking lots of water or weighing yourself with clothes. And also 400 calories is small. 7000 is 1 kg = 2.2 lbs
• Muscle weighs more than fat. So a solid body with a 28" waist can weigh more than a flabby 29" waist