When we do physical activity, our body sweats to cool down. This sweat contains water and other important minerals that our body needs. In hot weather, we sweat even more. If we don't replace the fluids lost through sweat, our body can become dehydrated. Dehydration can make us feel tired and weak, and it can even be dangerous. So, it's important to drink water or sports drinks to replace the fluids we lose during physical activity, especially in hot weather.
