why do i weigh more after exercise

I have noticed a 2-3lb. weight gain after a non-sweaty workout.

I didn't drink fluids or eat anything either.

The only way I can rationalize this is to understand some basic physics. body weight is a number that reflects mass in relation to gravity. the only way to gain "weight" is to have increased your mass or gravity. I am no expert maybe someone out there is, but our bodies have gases that have specific gravities. and perhaps stimuating the muscles and body through exercise we alter the amounts and types of gases which translates into weight gain.  again  I am no expert but maybe someone could further elaborate.

hope this helped more than it confused.

When you exercise you are working and toning the muscles. Because the muscles will be growing because of the workout, even though it burns more fat muscle weighs more than fat. So by working out you will start off by weighing more before you start to weigh less. I would imagine that if you carry on doing exercise your weight will eventually start to drop once your muscles have reached their peak and stopped growing and continued burning fat.

omg last answer is sooo wrong... muscle does not weigh more than fat...

its like saying what weights more? 1 pound of feathers or 1 pound of cement.... its both the same its jsut muscles are more dense therefore taking less space