In this case, it is necessary to collect evidence, report to relevant personnel or organizations, and explore legal channels.

1. Collect evidence: record the specific time, place, content and witnesses (if any) of each sexual harassment. You can use your mobile phone to record, take photos or video to collect evidence. At the same time, keep all communication records related to sexual harassment, such as text messages and chat records.

2. Report to relevant personnel or institutions: You can report this matter to the management or human resources department of your gym and provide the collected evidence.

3. Explore legal channels: It is very important to understand the legal definition of sexual harassment and related legal procedures. You can consult a professional lawyer to understand your legitimate rights and interests and countermeasures.