Walking exercise and health before sunrise or after sunset

It's so hot these days that I go for a walk before sunrise or after sunset. But here's a question: Is it really good for your health to exercise while being exposed to the sun in the summer? If you exercise while applying sunscreen, it's bad for your skin, and if you sweat too much, you might feel a little dizzy. But when it's hot and you sweat too much, the military gives you a little salt to eat.

I wonder if I don't need to eat salt

Even in summer, if you don't necessarily need to exercise before sunrise or after sunset, you'll probably have some free time...