Lični trener meri moj puls u teretani.

Because trener is a masculine singular noun, and adjectives in Serbian must agree with the noun in gender, number, and case.

• lični = masculine singular nominative
• lična = feminine singular nominative
• lično = neuter singular nominative

So:

• lični trener = correct
• lična trener = incorrect

It is in the nominative case because it is the subject of the sentence — the person doing the action.

In this sentence:

• Lični trener = subject
• meri = verb
• moj puls = object
• u teretani = location

Here moj puls is the direct object of the verb meri (measures), so it is in the accusative case.

However, puls is a masculine inanimate noun, and in Serbian, masculine inanimate nouns usually have the same form in nominative and accusative singular.

So:

• nominative: moj puls
• accusative: moj puls

That is why the form does not change.

If it were a masculine animate noun, the accusative would usually look like the genitive instead.

Because u can mean either in/at or into, depending on the case used after it.

Here the sentence describes location, not movement, so Serbian uses the locative case:

• u teretani = in/at the gym

Compare:

• u teretani = in the gym, at the gym → location
• u teretanu = into the gym → movement toward

So the sentence uses u teretani because the action happens there.

Meri is the 3rd person singular present tense of the verb meriti (to measure).

So:

• ja merim = I measure
• ti meriš = you measure
• on/ona/ono meri = he/she/it measures

Since lični trener is a singular subject, meri is the correct verb form.

Mostly yes. The Serbian present tense here can describe:

• something happening right now
• a habitual or repeated action
• a general present situation

So Lični trener meri moj puls u teretani could mean either:

• My personal trainer is measuring my pulse at the gym
• My personal trainer measures my pulse at the gym

Serbian often relies on context where English might choose between simple present and present continuous.

Yes. Serbian word order is more flexible than English because case endings help show grammatical roles.

The neutral/basic order here is:

• Lični trener meri moj puls u teretani.

But other orders are possible, for example:

• Moj puls meri lični trener u teretani.
• U teretani lični trener meri moj puls.

These may change the focus or emphasis, but not necessarily the basic meaning.

English is much less flexible, so learners often expect Serbian word order to be fixed when it is not.

Because Serbian does not have articles like English a/an and the.

So nouns like trener, puls, and teretana appear without an article. Definiteness is usually understood from:

• context
• word order
• possessives like moj
• demonstratives if needed, such as taj (that)

So moj puls already clearly means my pulse, and u teretani is understood from context as in the gym/at the gym.

Yes. Puls is a normal and common Serbian word for pulse in the medical or physical sense.

You may also hear more descriptive expressions depending on context, but puls is completely natural and standard.

A simple pronunciation guide:

• Lični ≈ LEECH-nee
• trener ≈ TREH-nehr
• meri ≈ MEH-ree
• moj ≈ moy
• puls ≈ pools
• u ≈ oo
• teretani ≈ teh-reh-TAH-nee

A few useful notes:

• č sounds like ch in church
• j sounds like English y in yes
• Serbian pronunciation is usually quite phonetic: words are mostly pronounced as written

Yes, you may hear personalni trener, especially because it resembles the international word personal. But lični trener is a perfectly natural Serbian expression and is often preferred in more standard Serbian usage.

So both may be understood, but lični trener is an excellent form to learn.

You negate it by putting ne before the verb:

• Lični trener ne meri moj puls u teretani.

This means My personal trainer is not measuring my pulse at the gym or does not measure my pulse at the gym, depending on context.