She was going to have quadriceps and deltoids.

她本来就有股四头肌和三角肌。

Just take it usually to their quadriceps or to their calves.

通常在股四头肌或小腿部位使用。

Now you can almost see my quadriceps is toned here.

你们可以看到我的四头肌很紧张。

So it's the same muscle groups that we use, this muscle that we need, the glutaeus and the quadriceps, to really extend both joints at the same time.

这就是我们用的肌肉群，我们需要的这块肌肉，臀肌和股四头肌，同时伸展两个关节。

However, this was not the case for all muscle groups, where only lower body muscles, particularly the quadriceps, saw an effect similar to the levels of high caffeine intake.

然而，并非所有肌肉群都是如此，只有下半身肌肉，尤其是四头肌，看到了与高咖啡因摄入水平相似的效果。

The four muscles, the quadriceps — that come in the front of the knee that attach just beyond the knee, in the front of the shin — they have to fire constantly to give you some stability.

四块肌肉，即股四头肌——位于膝盖前方， 紧接在膝盖之外，在胫骨前方——它们必须不断地发力才能给你一些稳定性。