Of course. You can report the illegal or illegal operation of gyms or other businesses to the tax authorities or relevant competent departments. Tax declaration can be a citizen's behavior, aiming at exposing dishonest enterprises or tax evasion and other tax violations, and ensuring that there is conclusive evidence to support the report. Evidence can be payment vouchers, transaction records, screenshots, chat records, etc. These evidences can prove that the gym has taken illegal or illegal business practices, such as failing to file tax returns according to regulations and evading taxes.