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5分钟懒人开肩薄背操！有用！手臂酸炸了~
这组超适合手臂粗后背肉多的姐妹 背薄一寸年轻十岁，一起练出少女背！ 站着坐着居家办公可以跟着动起来哦~ 每天循环六组，手臂真的会酸到不行~ 注意：核心收紧，沉肩下压，不要耸肩 跟练：MIZI(上半身训练)
瘦手臂后背！73/154
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