Dansegrepet brukes i dansestillingen.

Brukes is the present passive form of å bruke (to use).

• å bruke = to use
• bruker = uses / is using
• brukes = is used

Norwegian often makes a passive verb by adding -s:

• selge → selges = is sold
• bruke → brukes = is used

So brukes here means is used.

In Norwegian, the definite article is usually attached to the end of the noun.

So instead of saying a separate word like English the, Norwegian often says:

• et dansegrep = a dance grip/hold/move
• dansegrepet = the dance grip/hold/move

and

• en dansestilling = a dance position/stance
• dansestillingen = the dance position/stance

So the endings themselves carry the meaning of the.

Because the two nouns have different grammatical genders.

• et dansegrep → neuter noun
• en dansestilling → common-gender noun

In the definite singular, that gives:

• neuter: -et → dansegrepet
• common gender: -en → dansestillingen

The important thing is the gender of the main noun at the end of the compound:

• grep is neuter
• stilling is common gender

Yes. Norwegian usually writes compound nouns as one word, much more often than English does.

So:

• danse + grep → dansegrep
• danse + stilling → dansestilling

This is very normal in Norwegian. English learners often want to split these up, but in Norwegian they are typically written together.

Grep can have a few related meanings, depending on context. It often means something like:

• grip
• hold
• technique
• move

So dansegrep could mean different things in English depending on the dance context. In some situations, hold may sound most natural; in others, move or grip may fit better.

That is normal: one Norwegian word does not always match one exact English word in every context.

Here i means in and is used for being in a position, form, state, or arrangement.

So i dansestillingen means something like:

• in the dance position
• in that dance stance/hold

Norwegian often uses i where English also uses in, especially with positions or configurations.

Yes. Dansegrepet blir brukt i dansestillingen is also correct.

Both are passive, but they feel a little different:

• brukes = short, compact, often neutral and common in written Norwegian
• blir brukt = also very common, sometimes a bit more explicit

So:

• Dansegrepet brukes i dansestillingen
• Dansegrepet blir brukt i dansestillingen

Both can mean basically the same thing here.

The sentence has a very standard Norwegian main-clause structure:

• Dansegrepet = subject
• brukes = finite verb
• i dansestillingen = prepositional phrase

So the pattern is:

subject + verb + prepositional phrase

This is a normal declarative sentence.

Then Norwegian follows the V2 rule, which means the finite verb still has to stay in the second position.

So you get:

• I dansestillingen brukes dansegrepet.

Notice what changed:

• the prepositional phrase moved to the front
• the verb brukes stayed in second position
• the subject dansegrepet moved after the verb

That is very typical Norwegian word order.

The dictionary/basic forms are:

• et dansegrep
• en dansestilling
• å bruke

And in the sentence they appear as:

• dansegrepet = definite singular of et dansegrep
• dansestillingen = definite singular of en dansestilling
• brukes = present passive of å bruke

So if you were looking them up, those are the forms you would usually search for.