专用术语
混元太极：人身有十八个球。组成人体一小宇宙。
实用拳法：人身有十八个齿轮。组成人体一个齿轮箱。

相关词：十八个点，十八个圈，十八个可动点

1. 头顶
2. 脚（后跟或者前掌）
3. 腕
4. 肘
5. 肩
6. 胯
7. 膝
8. 踝
9. 百会穴和会阴的竖线

以上左右成对。故有十八个。

这十八个球怎么数不重要。记住肘肩胯，胯膝踝，百会穴和会阴穴的立线这三个重要的组合即可。

Terminology
Hunyuan Taiji: There are eighteen balls in the body. It makes a human body a small universe.
Practical Method: There are eighteen gears in the body. It makes a human body a gear box.

Related words: 18 points, 18 circles, 18 movable points

1. Top of the head
2. Foot (heel or forefoot)
3. Wrist
4. Elbow
5. Shoulder
6. Kua
7. Knee
8. Ankle
9. Vertical line between Bai Hui and Hui Yin

There are left and right for the above, which make eighteen.

It doesn’t matter how these eighteen balls are counted. Remember the three important combinations:

1. Elbows, shoulder, kua
2. Kua, knee, ankle
3. Vertical line between Bai Hui and Hui Yin