Choreografie je nová a držení těla je důležité.

Because nová has to agree with choreografie in gender, number, and case.

• choreografie is a feminine singular noun
• the sentence uses the nominative case, because choreografie is the subject
• so the adjective must also be feminine singular nominative: nová

Compare:

• nový = masculine
• nová = feminine
• nové = neuter

So Choreografie je nová means The choreography is new.

Because důležité agrees with držení, and držení is neuter singular.

So:

• držení = neuter singular
• adjective/predicate adjective must match it
• therefore: důležité

This is the same agreement pattern as:

• Auto je nové. = The car is new.
• Město je krásné. = The city is beautiful.
• Držení je důležité. = The posture/holding is important.

Držení těla is a fixed expression meaning posture.

Literally, it is something like:

• držení = holding, keeping, the act/state of holding
• těla = of the body

So the literal structure is holding of the body, but in natural English it means posture.

This is a very common Czech way of expressing ideas that English often packs into one word.

Because těla is in the genitive singular.

The base noun is:

• tělo = body

In the phrase držení těla, Czech uses a pattern similar to noun + of + noun in English:

• držení = holding
• těla = of the body

So těla is the genitive form of tělo.

A few similar examples:

• barva auta = the color of the car
• konec filmu = the end of the film
• držení těla = posture / holding of the body

Because the sentence has two coordinated clauses joined by a (and):

• Choreografie je nová
• a držení těla je důležité

Each clause has its own subject and its own form of být (to be), so je appears twice.

In English, you also usually repeat is:

• The choreography is new and posture is important.

You generally would not omit the second je in a normal Czech sentence like this.

A means and.

It connects two equal parts of the sentence:

• Choreografie je nová
• držení těla je důležité

So the structure is simply:

• X je ... a Y je ...

Be careful not to confuse Czech a with English a/an. Czech does not have articles.

Because Czech has no articles.

English needs words like:

• a
• an
• the

Czech does not use them. The meaning is understood from context.

So:

• Choreografie je nová. can mean The choreography is new or A choreography is new, depending on context.
• Držení těla je důležité. can mean Posture is important or The posture is important, depending on context.

This is very normal in Czech.

Yes. In Czech, many nouns ending in -ie are feminine, including choreografie.

That is why it takes feminine agreement:

• ta choreografie
• nová choreografie

This may feel unusual if you are expecting feminine nouns to end only in -a, but Czech has several feminine patterns.

Držení is a verbal noun derived from the verb držet (to hold, keep).

Very roughly:

• držet = to hold
• držení = holding / keeping

This -ní / -ení type of noun is very common in Czech and often names an action, process, or state.

Examples:

• číst = to read → čtení = reading
• cvičit = to exercise → cvičení = exercise / exercising
• držet = to hold → držení = holding

In držení těla, the expression has a specialized meaning: posture.

Yes, Czech word order is more flexible than English, but the neutral order here is very natural:

• Choreografie je nová a držení těla je důležité.

You could change the order for emphasis, but it may sound marked or literary depending on context.

For example:

• Nová je choreografie a důležité je držení těla.

This is possible, but it emphasizes nová and důležité more strongly and is less neutral.

For learners, the original order is the best one to use.

A few useful pronunciation tips:

• ch in Czech is not like English ch in chair. It is a rough sound like the ch in Scottish loch or German Bach.
• ř does not appear in this sentence, so that is one less thing to worry about.
• á, é, í, ů are long vowels and should be held a bit longer.

Approximate pronunciation:

• choreografie ≈ kho-re-o-gra-fi-ye
• důležité ≈ doo-le-ji-teh

Also remember that Czech stress is usually on the first syllable of the word:

• CHOreografie
• DŮležité
• DRŽEní
• TĚla

It is singular.

The head noun is držení, which is singular, and that is why the verb and adjective are singular too:

• držení těla je důležité

If it were plural, you would need plural agreement.

Even though English sometimes treats ideas like posture in a general way, Czech still uses the singular form here.