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。
Quadriceps Stretch: the quadriceps is the muscle in the front of the thigh, important for lifting your knees and increasing your speed.
在一系列的跑步，拉伸，速度，敏捷的训练后，练习赛开始。
A practice game followed a series of running, stretching, speed and agility exercises.
拉伸速度的变化对强度变异系数的影响不大。
The drawing speed has little influence on the strength variable coefficient.
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