First of all, we can't determine the fitness instructor's intention, because we don't have enough information to judge his real thoughts. His words and deeds may be just out of professional needs or an encouragement to you, or you may find them interesting.

However, from his words and deeds, we can see some signs that may be meaningful. If he often praises your beauty and only says such things to you, it may be a sign that he pays special attention to you. He may call you a "little girl" to show his love for you.

However, these signs do not necessarily mean that he is interested in you. Therefore, we need more information to judge his real thoughts. If you feel troubled or insecure, you can consider talking to him to clarify his intentions and let him know how you feel.

The most important thing is that no matter what his intentions are, you should maintain self-confidence and self-worth, and don't care too much about his evaluation or behavior. It is important that you should respect your feelings and needs and make the decision that suits you best.