That means you have to initiate the reflexes for activating the supporting and the free leg by the hip extension and the load.
这表示你必须通过对髋关节的牵拉和负重刺激出那能激活支撑和自由活动腿部的反射。
2
I might start with a bigger bike for more legextension.
我可能会开始更大更多的自行车腿延长。
3
There is proper legextension between the saddle and the pedals. Do this by having a friend steady your bike, or mount your bike in a stationary trainer with the wheels level.