大德德平日樂於助人，守護小精靈決定送他一套很威風的英雄裝甲獎勵他。然而，當大德德穿上了裝甲才漸漸發現原來自己平日姿勢不正確，引起身體痠痛......在守護小精靈的引導下，大德德終於明白保持正確姿勢的重要性。
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