First, stars are willing to send fitness photos because they want to tell outsiders that it is a positive way for stars to keep fit and sell a wave of body marketing by the way.
No matter who does it, fitness is actually good, because fitness itself promotes health, and artists are no exception. Fans who always send beautiful photos will get tired of watching them, so they will make some other different things to let the outside world see the efforts of artists and set off a wave of enthusiasm. If there is an endorsement or something, they will probably come to seek cooperation when they see this number, but there is no endorsement or anything. Maybe a producer will think the role is suitable after seeing these photos, so he found a job.
Second, the stars send these photos for a purpose, either for resources or to cause heat, and will not send photos for no reason.
However, I think there is a purpose in sending photos. Since the film was released, her popularity has gradually declined. There is nothing to shoot now. She can only rely on some photos to maintain her popularity. After all, there are no works that can't disappear directly in front of the camera, and there will be more in the future. If the popularity is gone, it will be difficult to promote movies or dramas in the future, and there will be a lot of trouble in obtaining resources. So in order to develop in the future, she must constantly update her status.
Finally:
Zhang's figure is really ok. She looks really thin and muscular. This figure will look better with clothes on. It is estimated that this is also her efforts for development.