Legal analysis: the gym should bear the responsibility for losing things. According to relevant laws, consumers have the right to property safety when receiving services. Operators should take reasonable, legal and effective measures to protect consumers' property stored in lockers. Operators shall take necessary and reasonable measures to protect the personal and property safety of lockers and other places they provide to consumers.

Legal basis: People's Republic of China (PRC) Consumer Protection Law.

Article 7 Consumers have the right to protect personal and property safety when purchasing and using commodities and receiving services. Consumers have the right to demand that the goods and services provided by business operators meet the requirements of protecting personal and property safety.

Article 18 Business operators shall ensure that the commodities or services they provide meet the requirements of protecting personal and property safety. For goods and services that may endanger personal and property safety, consumers should be given a true explanation and a clear warning, and the methods of correctly using goods or receiving services and the methods of preventing harm should be explained and marked. Operators of hotels, shopping malls, restaurants, banks, airports, stations, ports, theaters and other places of business shall fulfill their obligations of safety protection for consumers.