Quadriceps Stretch: the quadriceps is the muscle in the front of the thigh, important for lifting your knees and increasing your speed.
拉伸股四头肌：股四头肌是大腿前侧的肌肉，对于你提升膝盖和提高速度很重要。
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This narrow muscleof the thigh passes obliquely across the front of the thigh and helps rotate the leg to the position assumed in sitting cross-legged.
这块大腿上的狭长肌肉斜跨大腿前部，作用是在你采取盘腿坐姿时帮助旋转腿部，使其到位。
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The Sartorius, a muscle that run down the front of the thigh at an angle, further stabilizes the pose.