Working up a sweat may be healthy for a short spell in the gym, but it can be dangerous if you’re doing hard physical labor over a full shift during the dog days of summer, says the United Auto Workers’ Safety and Health Department.
Sweating is normally good because that’s how your body tries to maintain a stable internal temperature. But sweating is effective only if the humidity level is low enough or air is moving across your skin and if body fluids and salt are adequately replaced.