Jumping in the pool all day may seem like a good idea, yet it can potentially lead to even more moisture loss to your skin. Despite all that moisture, your skin can dehydrate even more. Being surrounded by water means nature, in an attempt to reach a state of equilibrium, will suck the mineral-rich water out of your body cells to try and equalize with the water around you. So, while you may be in water, your body will dry out. This is why applying lotion after a swim is so important.