Stay hydrated and take time to cool down from time to time. If you get to low on electrolytes you can have some serious heart arrhythmias and even a heart attack. If you ever stop sweating, you are in DEEP TROUBLE and need to go to an ER IMMEDIATLY!
If your body temp gets above about 104 you can suffer permanent brain damage if it isn't brought down NOW.
Heat-related illnesses consist of three stages, ranging from relatively mild to life threatening: heat cramps, heat exhaustion and heatstroke, respectively.
