the concept here is called homeostasis, our cells are actively trying ot balance out the amount of water and salts inside themselves to facilitate cellular operations and part of the mechanism that regulates this relies on the fact that levels of salts inside and outside of the cell will naturally attempt to equalize. the presence os salts is the mechanism used ot balance this out.
as you perform strenouos activites you are losing both water and salts that you can replenish by drikning water and can assist with a small dosage of these salts that enable a smoother stabilization.
problem is with sea water you have WAYYY too much salt and the physics involved will pull the water out of the cells in a futile attempt ot equalize causing dehydration and putting salt level as such dangerous high level your kidneys have no chance ot be able ot deal with without causing damage.
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