Frillylily said:Drink ALOT of water. Alot.
I'm not a medical professional or anything like that but water is not enough - you also need potassium and sodium and a few other things. If a person sweats and drinks too much water they can upset their electrolyte balance and yes, the heart will have trouble keeping up. The electrolytes need to be replaced in the same proportion they are lost. There are products such as Gatorade, Powerade, etc., or Emergen-C or you can Google to find recipes:
