You sweat so much when you work out because sweating is your body's natural way to cool itself down. When you exercise, your heart rate and core body temperature rise, triggering your sweat glands to produce sweat. As sweat evaporates from your skin, it helps release heat and cool your body.

Factors influencing how much you sweat during workouts include:

• Having overactive sweat glands, which can be inherited or related to health conditions like hyperhidrosis.
• Body size, as larger bodies generate more heat and thus sweat more.
• Starting exercise with an elevated body temperature from things like spicy food or illness.
• Your fitness level—more trained individuals may sweat earlier and more efficiently to regulate temperature.
• Environmental conditions such as heat and humidity.
• Genetic predispositions, age, and gender also play a role.

Sweating a lot during exercise is generally a good sign that your body is effectively regulating its temperature to prevent overheating. However, excessive sweating beyond normal exercise needs may indicate a condition called hyperhidrosis, where sweat glands are overactive.