The research into the climate responsibility of health club operators is important from both environmental and business perspectives. This research aimed to understand the current situation in the industry, promote sustainable development, and address the increasing challenges of environmental awareness and expectations. There are approximately 205,180 health and fitness clubs worldwide, with an estimated 184,59 million gym memberships globally. The industry is substantial and reaches a large number of people worldwide. By examining the climate responsibility of health clubs, it's was possible to identify their environmental impacts, particularly in terms of emissions, energy consumption, and waste generation. With growing environmental awareness and expectations among consumers and investors, studying the climate responsibility of fitness centers provided insights into how these businesses are responding to environmental concerns and implementing measures to reduce their environmental footprint. Health clubs can serve as examples and leaders in sustainable development, offering valuable lessons and innovations that can be applied to other industries. The theoretical framework of the thesis comprised literature and electronic sources covering ESG reporting, EU legislation, environmental responsibility, corporate sustainability, green transition, and circular economy. The chosen research method was qualitative, utilizing the latest sustainability reports of selected companies as data. The analysis aimed to combine descriptions from the material with the researcher's interpretation. Document analysis was used to achieve this, with the thesis adopting a case study approach to analyze the operating methods related to sustainable development and responsibility in the European health club industry. Grounded theory was employed in data analysis to derive logical categories from the research material. The study revealed that companies emphasize their commitment to sustainable development and reducing environmental impacts. However, efforts to combat climate change outlined in sustainability reporting were not readily apparent to operational staff or current and potential members. Health clubs are increasingly focusing on climate responsibility through measures like energy efficiency, renewable energy adoption, and waste reduction to achieve net-zero carbon emissions. They integrate climate responsibility themes into ESG reporting but require more detailed information and daily management involvement for effectiveness. Various strategies, including energy mapping and alignment with initiatives like SBTi, are employed. Corporate management, led by the board of directors, is crucial in fostering climate responsibility by integrating sustainability into business strategy, prioritizing shareholder value within a sustainable framework, and actively engaging in risk management. This commitment reflects a dedication to environmental stewardship alongside business success.