[問題] 舉重選手做背蹲時的背何以這麼挺直？
無意間看到水管上呂小軍做背蹲的片段，
為什麼他的背可以這麼挺直，我指的直並非單指脊柱中立，而是起槓站穩後，身體幾乎垂直地面的蹲下，即使超過3.5倍體重，還是沒有傾斜的感覺，覺得他蹲的很clean、看起來很舒服。
為什麼呂小軍這麼強？告訴我，好噗好？
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