18 Things That Happen to Your Body When You Don't Drink Enough Water

Your muscles keep cramping up
When your muscles seize up near the end of a grueling workout, it might be because it was a bad idea to have "going to the gym more" as one of your New Year's Resolutions. It might also be because your body is - you guessed it - dehydrated. When you exercise, you sweat, and when you can't get that water back, you take it from other places in your body; namely, the very muscles causing you to sweat so badly. The Mayo Clinic says that athletes in warm-weather climates especially should be sure to drink extra water to avoid these effects.