It is necessary, but it depends on what kind of exercise you do. If you do equipment strength exercise, you still need to stretch. If it is aerobic, it doesn't matter.

The advantage of male bodybuilders' stretching is that they can grow muscles more effectively, because the growth mode of muscles is like this: when you do strength exercises with equipment, it is actually a process of tearing muscles, and you will feel the tearing feeling of muscles, which is indeed the tearing of muscle fibers. Through rest and nutritional supplement after exercise, muscle tissue will be automatically repaired, and during this repair process, muscles will grow excessively, which means that muscles will not only be repaired to the level before you tear, but also increase in size. The meaning of stretching is to tear some muscles that are not completely torn, so you will also feel the tearing feeling of muscles when stretching, which is also very beneficial to muscle growth.