The basic height requirements of fitness instructors are boys 160CM and above, and girls 155CM and above. Therefore, both boys and girls can be fitness instructors with a height of 160CM. The height of a fitness instructor is not a very attractive condition, because there is no special requirement for height in the work of a fitness instructor, and now there are many short fitness instructors doing very well in their work.
160CM is not particularly tall, but it is entirely possible to be a fitness instructor, regardless of the height range of boys and girls.