Začátečníci chodí po studiu při rozcvičce.

Because chodí comes from chodit, which usually expresses a repeated, habitual, or general action.

So in this sentence, it suggests something like:

• this is what beginners do during warm-up
• they walk around as part of the routine

By contrast, jdou comes from jít, which is more about one specific movement happening now or a single trip in one direction.

So:

• Začátečníci chodí... = beginners walk / go around regularly
• Začátečníci jdou... = beginners are going somewhere right now

Začátečníci is the nominative plural of začátečník (beginner).

It is the subject of the sentence, so nominative is required.

• singular: začátečník
• plural: začátečníci

This noun is masculine animate, and masculine animate nouns often have this kind of plural ending in the nominative.

Because the preposition po requires a different case here: the locative.

The noun studio is neuter, and its locative singular is studiu.

So:

• nominative: studio
• locative: studiu

That is why you get po studiu.

Not necessarily. Po has several meanings in Czech, depending on context.

Common meanings include:

• after
• along / over / around
• sometimes other more idiomatic uses

In this sentence, if the meaning shown to the learner is about movement in the studio, then po studiu means something like around the studio or through the studio area, not after the studio.

This is very important: Czech prepositions often have more than one meaning, and you cannot translate them with just one English word every time.

Yes, it can be.

Without context, po studiu could potentially be understood in two different ways:

1. po + studiu from studio
   = around the studio

2. po + studiu from studium
   = after study / after studying

Both can produce the form studiu.

So context is what tells you which meaning is intended. If the meaning has already been shown to the learner, then that resolves the ambiguity.

Rozcvičce is locative singular.

That is because the preposition při requires the locative.

The base noun is:

• rozcvička = warm-up

Its locative singular is:

• při rozcvičce = during the warm-up

So the pattern is:

• při + locative

Při rozcvičce means during the warm-up or in the course of the warm-up.

It is not exactly the same as na rozcvičce.

• při rozcvičce focuses on what happens during the warm-up
• na rozcvičce often means at the warm-up session more generally

So here při rozcvičce is a good choice because it links the walking action directly to the time when the warm-up is happening.

Not especially. The sentence is understandable in this order, and Czech word order is quite flexible because case endings show grammatical relationships.

This sentence is roughly:

• Začátečníci = subject
• chodí = verb
• po studiu = where/how they move
• při rozcvičce = when

But Czech can move these parts around for emphasis. For example:

• Při rozcvičce chodí začátečníci po studiu.
• Začátečníci při rozcvičce chodí po studiu.

These do not radically change the core meaning, but they shift what sounds most prominent.

Yes. Chodit can have several related meanings in Czech, for example:

• to walk
• to go regularly
• to attend
• sometimes to happen repeatedly

Examples:

• Chodí do školy. = He/She goes to school
• Chodím tam často. = I go there often
• Chodí po studiu. = They walk around the studio

In your sentence, because of po studiu, the most natural meaning is literal movement on foot.

Yes, but it would mean something different.

• ve studiu = in the studio
  This mainly expresses location.
• po studiu = around the studio / through the studio
  This suggests movement within that space.

So:

• Začátečníci chodí ve studiu = Beginners walk in the studio
• Začátečníci chodí po studiu = Beginners walk around the studio

The second one gives a stronger sense of moving around inside that environment.

It is grammatical, but without context it may feel a little unusual because po studiu is potentially ambiguous, and some speakers might expect a clearer phrase depending on the exact intended meaning.

For example, if the meaning is clearly physical movement inside the studio, some speakers might also say something like:

• ve studiu
• po sále
• po místnosti

depending on what kind of space is meant.

So the sentence works, but context matters a lot. A learner should mainly notice the grammar patterns:

• chodit for habitual action
• po + locative
• při + locative