How much do you typically sweat?

Light: Small amounts of sweat appear on your forehead.
Moderate: Large amounts of sweat on your forehead, neck and armpits.
Heavy: Your head drips with sweat. Your shirt frequently becomes saturated in armpits and chest areas. Salt deposits may also accumulate in those zones.

Sweat is by far the most efficient way your body has to cool itself. Your body will sweat in response to internal overheating regardless of the temperature outside. Through sweat you lose about 1-liter of water per hour during moderate activity. How much you typically sweat is a key factor in determining how much water you need to drink during your activity to replenish the loss of fluid.

Learn how to calculate your sweat rate.