What are some ways your body regulates the increase of body temperature that also occurs when exercising?

When heat activates sweat glands, these glands bring that water, along with the body's salt, to the surface of the skin as sweat. Once on the surface, the water evaporates. Water evaporating from the skin cools the body, keeping its temperature in a healthy range

1) according to the law of conservation of mass ,in all chemical reactions total mass is unchanged

Higher temperature = molecules move around faster. and vice versa.