An (按)

An (按) is the fourth of the four cardinal gates of Taijiquan — the downward press. The character is conventionally translated push, but the translation is misleading and Sifu Adam Mizner is emphatic in correcting it: an is fundamentally a downward press, not a forward shove. The classical image is submerging a ball into water — a continuous heavy weight that travels through the partner toward the ground, compressing their structure into the floor rather than driving them backward through space. [1]

An is the closing energy of Grasp Sparrow's Tail (攬雀尾) — peng → lu → ji → an — and the sequence's final word. It is also the most easily counterfeited of the cardinal gates, because its outward shape (two palms going forward and down at the partner's chest) looks identical to an ordinary push. The difference between an and a push is entirely internal: what the body is doing while the hands move, and where the force is going.

The peng / an pairing

The most important structural fact about an is its reciprocal relationship with peng (掤). The two are paired in the canonical theory in a way that none of the other gates are paired with each other:

• Peng floats the partner. Its buoyant outward fullness, applied at the contact, captures the partner's incoming force and lifts their root off the ground — they become weightless and unable to push back through their feet.

• An then sinks them. Once the partner is floating, an compresses their structure downward into a root that is no longer there. The force travels through their body and tries to reach the ground, but their feet are not connected to it; the result is collapse.

The reverse order — pressing down before floating — does not work. An on a rooted partner just drives them into the floor: their structure resists vertically, the force has nowhere to dissipate, and they brace against the press. The classical phrasing is uncompromising: an depends on peng. Without sufficient peng first to compromise the partner's root, an cannot succeed.

This is why beginners can produce the shape of an indefinitely without ever producing the energy. The shape is downward-and-forward palms; the energy requires that peng has done its work first.

Mechanically — how an is generated

The body's contribution to an has three coordinated phases:

• Press the front foot into the ground. This is the ground connection that gives an its weight. The foot does not push backward; it presses down, and the ground reaction force becomes available to travel through the body.

• Stretch away from the hands. The body's intention is to retreat from the contact, even as the hands settle forward — the resulting tension is the long jin extension that gives an its through-the-partner reach. The hands stay at the partner; the body sends itself away from them.

• Drop the elbows. The elbows must hang and sink, not lift or flare. Lifted elbows turn an into a shoulder push and disconnect the force from the lower body.

The mature practitioner unifies two circles in this issue: a horizontal kua rotation that produces the dantian-driven directional component, and a vertical press-foot / sink-back cycle that produces the downward press. The two together give an its characteristic sinking-and-directional quality — not a flat push, not a pure sink, but a sink that travels at an angle through the partner's structure to their rear foot.

The classical instruction for the mental component of an is to place the mind-intention (yi, 意) in the partner's rear foot. The hands meet the partner's chest, but the intention reaches through their whole body and touches their base. The press compresses everything between the contact and the rear foot until the partner's structure has nowhere to put the force, and they fall. [2]

An in the form and in push hands

In the long form, an first appears as the fourth movement of Grasp Sparrow's Tail. The student learns the basic mechanic: press the front foot into the ground, release the pressure, and melt away from the fingers as long jin extends the hands forward to throat height. The "release the pressure" step is the key one most students miss: the press is not held; it is initiated and then released, and the release is what carries the force through the partner.

Throughout the form, an is named wherever a downward-pressing quality expresses through the hands — the closing of Needle at Sea Bottom, the sinking phase of many transitions, the dantian-driven press through the fingers in several postures. The student who has learned to recognize an as an energy rather than a posture finds it operating in many places the form does not label.

In push hands, an becomes a finishing technique. After the partner has been destabilized — by lu's redirection, by cai's pluck, by peng's float — an is the gate that finishes them off the ground. Mizner's specific instruction for the cai-an combination is "keep the partner teetering rather than letting them restabilize; only then sink under and deliver an." [1] The pre-an phase keeps the partner unable to find their root; the an phase sinks them through the root they no longer have.

Where an meets fajin

At the higher levels of training, an jin (按勁) can transition into fajin (發勁) — the explicit issuing or burst discharge. Once the partner's root is compressed and they begin to fall in, the sustained sinking quality of an can release as a sudden through-the-body discharge. This is one of the canonical senior skills of the cardinal gates: downward fajin into a braced partner.

The transition from an to fajin is not a separate technique; it is the same energy expressed at a different timescale. An held continuously is the streaming press; an released as a sudden discharge is the fajin form. Both depend on the same structural conditions: peng underneath, kua release, foot pressing down, intention reaching the partner's rear foot.

Related concepts

Ba Men (八門) — the Eight Gates; an is the fourth

Peng (掤) — an's necessary partner; peng floats, an sinks

Lu (捋) — the second gate; precedes an in the Grasp Sparrow's Tail sequence

Ji (擠) — the third gate; immediately before an in the sequence

Fajin (發勁) — issuing force; an jin can release as fajin once the partner's root is compressed

Song (鬆) — without enough song, an cannot sink through the partner

Sources

[1] Adam Mizner, Discover Taiji curriculum and seminar teachings — the emphatic distinction between an as downward press and an as forward shove is a recurring corrective of his transmission. The cai-an combination "keep the partner teetering... only then sink under and deliver an" and the formulation "if you can be song enough your partner will float, and only a floating partner is sinkable" are paraphrased from this teaching.

[2] The instruction to place the yi (mind-intention) in the partner's rear foot during an is a classical mental-mechanics teaching attested across the Yang-family transmission; the contemporary articulation here follows Mizner's curriculum.

[3] The classical Thirteen Postures Treatise (十三勢歌訣) closes the four cardinal energies with an, establishing the canonical peng–lu–ji–an order that the Grasp Sparrow's Tail sequence operationalizes.