13式 Shoulder Kào (肩靠)

13式  Shoulder Kào (肩靠)

This is one of the most difficult movements in the Eight Gates (八法). In my opinion, many people misunderstand Kào (靠, Shoulder Stroke/Body Bump) because they think it means hitting with the shoulder (撞肩). That is only partly true.

What is Kào (靠)?

The Tai Chi Classics say:

"Kào is like leaning against a mountain." (靠如山)

This means the entire body enters as one unit. The shoulder is merely the first point of contact, just as in Zhou (肘) the elbow is the first point of contact.

The real weapon is the whole body (整體勁).

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1. From Elbow (肘) to Shoulder (靠) without moving the feet

This transition is made by continuing the body's forward spiral, not by taking another step.

The sequence is:

• Finish the elbow strike (肘).
• Continue turning the waist (腰續轉).
• Relax the chest (含胸).
• Open the back (拔背).
• Slightly rotate the torso so the shoulder naturally replaces the elbow as the contact point.

The feet remain rooted.

The body continues to move over the supporting leg.

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2. Where should the left hand be?

Different lineages teach different placements.

Method A (my preferred method)

The left palm rests lightly on the right upper arm (右上臂) or near the deltoid (三角肌).

Advantages:

• Connects both arms.
• Prevents the right shoulder from lifting.
• Helps whole-body power.

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Method B

The left palm lightly touches the right shoulder (右肩).

Some Taiwan 13-Form schools use this.

Advantages:

• Creates a compact body frame.
• Easy for beginners.

Disadvantage:

If you press too hard, you tighten the shoulders.

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Method C

The left palm touches the right forearm (右前臂).

Less common.

Used mainly to maintain connection.

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3. Is the shoulder attacking together with the upper arm?

Yes—but not because the upper arm swings.

The upper arm becomes part of the body's "front wall."

Imagine the shoulder, upper arm, chest, and ribs forming one solid curved surface.

When the body advances,

the opponent may first contact:

• Shoulder (肩)
• Upper arm (上臂)
• Chest (胸)

depending on the distance.

So Kào is really a body attack (身靠) rather than only a shoulder attack.

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4. Should the shoulder move first?

No.

The shoulder should never be thrown forward.

Instead,

the waist and center move.

The shoulder simply arrives first.

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5. Biomechanics

The force path is:

Ground (地) → Feet (腳) → Legs (腿) → Kua (胯) → Waist (腰) → Spine (脊柱) → Rib cage (肋骨) → Shoulder girdle (肩帶) → Shoulder (肩).

Notice the shoulder is almost the last link.

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6. Best angles

These are approximate.

Right upper arm–torso

About 15°–30°.

The elbow stays close to the ribs.

If it opens wider than about 45°, body connection usually weakens.

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Right elbow

About 90°–110°.

Do not straighten it.

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Left supporting arm

Keep the elbow rounded.

The left hand touches lightly.

It should connect, not push.

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My interpretation

From all of our previous discussions about 原位 (maintaining the original arm-body relationship) and 整體勁 (whole-body power), I would interpret the Taiwan 13-Form movement this way:

The left hand is not there to strengthen the shoulder by pushing it. Rather, it acts like a bridge (橋) connecting the left side of the body to the right shoulder girdle. This helps integrate both shoulders through the chest and back so that when the body enters, the right shoulder, right upper arm, and torso behave as one unified structure.

Therefore, I would not call it a shoulder attack (肩撞) alone. I would call it a whole-body body-bump led by the shoulder (以肩領身靠).

That interpretation also explains why you do not need to move the feet. Once the elbow has entered, you simply continue the same kinetic chain. The elbow yields the contact point to the shoulder, while the body's forward momentum continues uninterrupted. This is mechanically more efficient than treating the elbow strike and shoulder stroke as two separate techniques.