Group 1 - Swimming is a popular summer activity, but it requires proper preparation and safety measures [1][2] - Safety assessments should include choosing regulated swimming venues and evaluating personal swimming abilities [3] - Warm-up exercises are essential before swimming to prevent injuries and prepare the body for physical activity [4] Group 2 - Different swimming styles such as breaststroke, freestyle, butterfly, and backstroke cater to various skill levels and preferences [5][6] - Beginners are advised to start with breaststroke, while more experienced swimmers can progress to freestyle and other styles [7][8] - Training should be gradual, with a focus on maintaining a safe heart rate and proper technique [8][9] Group 3 - Handling emergencies like choking or cramps during swimming is crucial for safety [10] - Post-swimming recovery includes stretching, nutrition, and hydration to replenish lost energy and prevent soreness [11] - Special considerations should be made for elderly individuals and children when swimming, ensuring proper supervision and safety measures [11]

Core Viewpoint - The National Health Commission of China emphasizes the health risks associated with noise exposure in both daily life and work environments, highlighting the need for preventive measures to protect workers' hearing [1][2] Group 1: Health Risks of Noise Exposure - Noise exposure can lead to significant damage to the auditory system, including hearing loss and, in severe cases, noise-induced hearing loss [1] - The severity of health damage is directly related to the intensity of noise and the duration of exposure [1] Group 2: Preventive Measures for Employers - Employers should improve processes by using noise-reducing materials to lower noise levels in the workplace [1] - Implementing soundproofing measures, such as enclosing noisy equipment, can help reduce noise transmission [1] - Regular occupational health checks for workers exposed to noise, including hearing assessments before, during, and after employment, are essential [1] Group 3: Personal Protective Measures for Workers - Workers are advised to use earplugs and hearing protectors as effective means to reduce noise exposure and protect their hearing [1] - It is crucial to select earplugs and hearing protectors that meet national standards and to learn the correct way to wear them [2] - Workers should consistently wear protective gear in noisy environments and minimize personal noise exposure during leisure activities, such as avoiding prolonged use of headphones at high volumes [2]