Questions & Answers about Redoviti trening pomaže mom zdravlju.
The subject is redoviti trening.
It is in the nominative singular because it is the thing doing the action of pomaže.
- trening = a masculine singular noun
- redoviti = an adjective that agrees with trening in gender, number, and case
So the whole subject phrase is nominative masculine singular.
Because it has to match trening.
In this sentence, redoviti is the masculine singular nominative form used with the noun trening.
You may also come across redovit trening in Croatian. The -i form is very common before a noun, so redoviti trening sounds completely normal.
The main thing for a learner is: adjectives change form to agree with the noun they describe.