La instructora revisa la postura corporal.

Because instructora is a feminine noun meaning female instructor.

• el instructor = a male instructor
• la instructora = a female instructor

Spanish nouns usually have grammatical gender, and the article must match:

• la for feminine singular
• el for masculine singular

So la instructora tells you the instructor is female.

Revisa is the third-person singular present tense of revisar.

That means it can translate as:

• she checks
• she reviews
• she examines

Here the subject is la instructora, so revisa means the instructor checks/reviews.

A quick pattern:

• yo reviso = I check
• tú revisas = you check
• él/ella revisa = he/she checks

In this sentence, revisar means something like:

• to check
• to review
• to inspect
• to examine

With postura corporal, it suggests the instructor is checking someone’s body posture to see whether it is correct.

Depending on context, revisar can also be used for things like:

• checking homework
• reviewing a document
• inspecting equipment

So it is a very useful general verb.

Spanish uses the definite article more often than English.

So la postura corporal is literally the body posture, but in natural English we might simply say body posture or posture.

In Spanish, using la here sounds normal and natural. Spanish often keeps the article with nouns where English might not.

Because the sentence is not explicitly focusing on whose posture it is. It just says the instructor checks the body posture.

If you say su postura corporal, that means his/her/your body posture, and it introduces a specific possessor.

Compare:

• La instructora revisa la postura corporal. = The instructor checks body posture / the body posture.
• La instructora revisa su postura corporal. = The instructor checks his/her/your body posture.

So the original sentence is more general or neutral.

In Spanish, most adjectives normally come after the noun.

So:

• postura corporal = body posture / bodily posture

Here corporal is a descriptive adjective meaning bodily or related to the body.

This noun + adjective order is very common in Spanish:

• salud mental = mental health
• actividad física = physical activity
• lengua española = Spanish language

Yes, you could, but postura corporal is more natural in many fitness, health, medical, or instructional contexts.

Compare:

• postura corporal = more technical or standard
• postura del cuerpo = more literal, sometimes a bit less idiomatic depending on context

So the original phrase sounds very natural if you are talking about exercise, yoga, dance, physiotherapy, or general body alignment.

Yes, Spanish word order is somewhat flexible, but La instructora revisa la postura corporal is the most neutral and standard order.

It follows the common pattern:

Subject + Verb + Object

• La instructora = subject
• revisa = verb
• la postura corporal = direct object

You could rearrange it for emphasis in some contexts, but the given version is the one learners should use as the basic model.

Because la postura corporal is a thing, not a person.

The personal a is usually used before a specific human direct object.

For example:

• Veo a la instructora. = I see the instructor.
• La instructora revisa la postura corporal. = no a, because postura corporal is not a person

So here you do not use the personal a.

Yes. Revisa can express different present-time ideas depending on context.

It can mean:

• She checks = a habitual action
• She is checking = what she is doing now

So this sentence could mean either:

• the instructor generally checks body posture, or
• the instructor is checking body posture right now

Spanish often uses the simple present where English might choose either simple present or present continuous.

You would say:

El instructor revisa la postura corporal.

Only the noun and article change:

• la instructora = the female instructor
• el instructor = the male instructor

The verb revisa stays the same because it is still third-person singular.