美丽的外皮下显现出结实而柔韧的肌肉，锋利弯曲的刚毛排列在脊骨上。
Its wiry, supple muscles were visible beneath its fine coat, and sharp curving quills lined its spine.
强健和强柔韧性的肌肉能使后背保持良好的形态。
研究人员认为太极之所以有疗效，原因不仅在于它能训练肌肉，改善柔韧性，也能提高病人对自身健康的整体观感。
Researchers believe that the exercises work by conditioning muscles and increasing suppleness as well as raising patients' overall feelings of wellbeing.
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