The water loss is due to sweating to cool the body.
Running in water presents your body with more resistance than running on dry land (in air) and so makes it a great exercise which is also a lot gentler on the joints than running .
Through respiration and perspiration.
you get dehydrated (lose body water) by doing lots of exercise or doing a tiring activity
Running boards do not make you lose more weight. However, using a running board instead of free-running is easier on your body, so in essence running boards make it easier to lose weight.
Water replaces the sweat you lose though sweating.
The body does not lose weight. However it is buoyed up equal to the weight of the amount of water that is displaced by the submerged parts of the body.
it helps you lose weight, .. and and helps you burn fat and calories
By sweating and peeing.
you get dehydrated (lose body water) by doing lots of exercise or doing a tiring activity
Maybe if you leave it running on you for at least a week.
They might lose water via sweat. Also, a lot of water as water vapor is lost by breathing.
by sweeting and by peeing