You're working out and feeling good. As you warm up, you start to sweat. Sweat starts dripping down your forehead, so you wipe it away. But wait! That sweat is there for a reason!
Sweat cools your body down through evaporation. As sweat turns from water to gas, it absorbs heat energy from your body and dissipates it into the atmosphere. Staying cool is important when working out, and every little bit helps. So next your you're feeling the burn, leave that sweat alone and enjoy the cooling sensation!