zhège dòngzuò de zīshì bù duì.

They are related, but not the same.

• 动作 = a movement, action, or motion
• 姿势 = posture, pose, bodily position

So 这个动作的姿势 means something like:

• the posture used for this movement
• the form/position in this movement

In contexts like sports, dance, martial arts, or exercise, this often refers to form. The speaker is not just saying the movement exists; they are saying the body positioning while doing it is incorrect.

的 links a modifier to a noun. Here it works like of or an attributive marker.

Structure:

• 这个动作 = this movement
• 这个动作的姿势 = the posture/form of this movement

So 的 connects 这个动作 to 姿势.

Without 的, the phrase would sound unnatural here, because Chinese usually needs a linker when one noun modifies another in this kind of relationship.

个 is the general classifier, and it is commonly used with 动作 in everyday speech.

So:

• 这个动作 = this movement

Even though some nouns have more specialized classifiers, 个 is very common and safe for learners in a sentence like this.

In very informal spoken Chinese, especially in some regional speech, you may hear 这动作. But for standard Mandarin and for learning purposes, 这个动作 is the better choice.

So:

• 这个动作 = standard and safe
• 这动作 = colloquial, less standard in learner Chinese

Because 对 here functions like an adjective/state word meaning correct/right.

In Chinese, adjectives can often act directly as the predicate, so you do not need 是.

Compare:

• 这个动作的姿势不对。 = The form/posture for this movement is incorrect.
• not 这个动作的姿势是不对。 in normal speech

This is a very common Chinese pattern.

They are similar, but 不对 is often more natural here.

• 不对 = not right, incorrect, off
• 错 = wrong, mistaken

In a correction about physical form, 不对 sounds very natural, like:

• your posture is off
• that’s not the right way

You could also hear:

• 这个动作的姿势错了。

That also works, but 不对 often feels especially natural when correcting technique, posture, or method.

It is written bù duì, but it is pronounced bú duì.

That is because 不 changes tone before another fourth-tone syllable:

• dictionary form: bù
• before duì (4th tone): bú duì

So in speech, say bú duì.

It modifies 动作.

The structure is:

• [这个动作] 的 [姿势]

So the sentence is talking about the posture of this movement, not this posture.

If you wanted to say this posture, you would say:

• 这个姿势

That would be a different structure and slightly different meaning.

Yes, but the meaning changes.

• 这个动作不对 = this movement/action is wrong
• 这个动作的姿势不对 = the posture/form used in this movement is wrong

The longer sentence is more specific. It focuses on how the movement is being done, especially the body position.

Not always. 姿势 can mean:

• posture
• pose
• bodily position

In coaching or training contexts, it can also be understood as:

• form
• positioning

So depending on the situation, 姿势不对 might be best understood as:

• your posture is wrong
• your form is wrong
• your positioning is incorrect

No. Here 对 is functioning as an adjective/state word meaning correct or right.

Chinese 对 can have different uses in different sentences, but in this one:

• 对 = correct
• 不对 = not correct

So it is describing a state, not acting as a verb like to answer or a preposition like toward.

Chinese usually puts modifiers before what they modify.

So the structure is:

• 这个动作 = this movement
• 的姿势 = its posture/form
• 不对 = is incorrect

Put together:

• [this movement] [its posture/form] [is incorrect]

This is a normal Chinese noun phrase plus predicate pattern.

Chinese often leaves out information that is obvious from context.

If a coach, teacher, or friend is watching you do something, 这个动作的姿势不对 naturally implies:

• your form for this movement is wrong

If the speaker wants to make it more explicit, they could say things like:

• 你这个动作的姿势不对。
• 你做这个动作的时候，姿势不对。

But if the context is clear, the shorter version is completely natural.