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直板高手苏志强教你直板进阶之：直板背面发球 https://www.bilibili.com/video/BV1Yp4y1k72L/ 直板背面发球技巧，前国家队美女教练讲解https://www.bilibili.com/video/BV1uV4y1J7F6/?spm_id_from=333.337.search-card.all.click 下雨天在家找找直板背面发球的感觉https://www.bilibili.com/video/BV1D3411773h/?spm_id_from=333.337.search-card.all.click 直板背面发球，95%的人都不知道https://www.bilibili.com/video/BV1Kg411U7tA/?spm_id_from=333.337.search-card.all.click 直板发奔球的两种动作（正面发球和背面发球）要领详解 https://m.163.com/v/video/VN4MQLQHU.html |
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