How to make whole body skin healthy and black?

You can go to the sun, preferably after 4 pm. Because there was plenty of sunshine at that time, it was harmless to health. Maybe go to the sun before 10 am, and don't go after 10 am to avoid sunburn. Some stars, such as Louis Koo, are tanned by the sun. But I don't recommend it because that kind of machine is generally more expensive. Good luck.