求翻译：由直体仰卧开始，正如骑自行车一样，双腿交替着踏步40次，逐渐加快速度，可以增至150次，同时注意将支点落在大腿的肌肉上，这样使得大腿的肌肉完全放松。是什么意思？

Sit straight start by the body, as riding a bicycle, alternating legs 40 times with no progress, gradually speed up, can increase to 150, while paying attention to pivot on the fall of the thigh muscles, which makes leg muscles completely relaxed.

The Commonwealth has begun, as supine bicycle alternating legs, like a backwards, gradually increasing speed 40 times, can be increased to 150, and at the same time noting the fulcrum of the thigh muscles, thus allowing the thigh muscles completely relax.

Lies supine the start by the straight body, just like rides the bicycle to be same, the both legs are taking turn the steps 40 times, speeds up the speed gradually, may increase 150 times, simultaneously pays attention the pivot falls on the thigh muscle, like this causes the thigh the muscle to rel

Starting from straight back, just like riding a bike, alternating legs still 40 times, gradually accelerating speed, can be increased to 150 times, bearing in mind the point falls on the thigh muscles, this makes the thigh muscles completely relaxed.

Starting from straight back, just like riding a bike, alternating legs still 40 times, gradually accelerating speed, can be increased to 150 times, bearing in mind the point falls on the thigh muscles, this makes the thigh muscles completely relaxed.