炎炎夏日，游泳是颇受大家欢迎的运动选项。从岸上到水中，从热身准备到游泳后身体恢复，其中门道 不少。 入水前做什么准备？ "安全是游泳的首要原则，既要做好环境评估，又要对自身能力水平心中有数。"浙江省温州市奥体游泳 学校教练张海强有20多年教学经验，他对游泳时的注意事项进行了介绍。 首先，要做好安全评估。 选择正规、安全的游泳场地。自然水域、公开水域情况复杂多变，除了细菌、寄生虫或污染物等隐患， 水温表层温暖、下层偏低，再加上可能有暗流，对游泳者的水平和经验要求极高，初学者务必远离。相 比之下，符合开放标准的游泳馆更安全，其对水质、照明、救生设施设备和救生员配备都有严格要求， 建议作为首选。 游泳前要评估个人身体能力。没有一定训练基础，不要贸然尝试高速、长距离游泳，避免出现体力不支 等情况。 其次，要做好热身训练。 不少人游泳时直接入水，忽略了热身环节。入水前，可在岸边做广播体操式的伸展、慢跑、模仿划水蹬 腿动作，提升肌肉温度，增加关节灵活性，为下水做好生理和心理准备。 入水后，不可马上"火力全开"，应先轻轻打腿、缓慢蹬腿、滑游，让心肺系统和肌肉组织逐步适应水环 境，降低突然剧烈运动引发的抽筋等风险。 二、练习 ...

Core Insights - The "Demon King" themed swimwear has gained significant popularity among consumers, featuring a bright yellow top with a black tiger stripe design reminiscent of Sun Wukong's outfit, making it a focal point for wearers [1] - JD.com is currently promoting a summer sale, offering discounts of 10% on various swimming products, including collaborations with brands like Zoke, Arena, and Speedo [1][7] Product Offerings - JD.com has partnered with Zoke to launch a range of co-branded swimming gear, including children's swim trunks, silicone swim caps, one-piece swimsuits, dry-wet separation backpacks, and bath towel capes [3][4] - The children's swim trunks feature a stylish print and a four-way stretch design for comfort, while the silicone swim cap showcases a fun design inspired by the "tightening spell" [3] - Other offerings include comfortable and professional swimwear options, such as Zoke's women's one-piece swimwear, which is chlorine-resistant and flattering, and Arena's "Little Cutie" series with unique comic prints [6] Promotions and Discounts - During the summer season, JD.com is providing additional discounts on swimwear, goggles, and anti-fog products, encouraging consumers to explore the "Fashion Summer" event for great deals [7]