Does the seven-year-old boy know much about China dance and modern dance? Does it fit?

Seven-year-old boys are ok, not too early. Boys don't practice dancing very much, there are not many modern dances, and there are more samba dances. The basic skills of dancing are the most difficult to practice. Pulling their legs is a process. Children want to go, don't be forced, it doesn't matter who says. They have different physical qualities and hobbies.