Skoro zakres ruchu jest większy, zaczynam ćwiczenie wzmacniające.

Here skoro means since / as / given that / now that. It introduces a reason or a fact that leads to the main action.

In this sentence, the logic is:

since the range of motion is greater, I start a strengthening exercise

Compared with other conjunctions:

• ponieważ = a more neutral because
• gdy / kiedy = when
• skoro often sounds like if that is already true, then...

So skoro is not just giving a cause; it often suggests a conclusion based on that cause.

Because Skoro zakres ruchu jest większy is a subordinate clause, and Polish normally separates subordinate and main clauses with a comma.

So the structure is:

• subordinate clause: Skoro zakres ruchu jest większy
• main clause: zaczynam ćwiczenie wzmacniające

This comma is required in standard Polish.

Because Polish uses the genitive after many nouns to express of relationships.

So:

• zakres = range
• ruchu = of motion / movement

This is a very common pattern:

• koniec dnia = end of the day
• początek roku = beginning of the year
• zakres ruchu = range of motion

Here ruchu is the genitive singular of ruch.

Zakres is the subject of jest, so it is in the nominative singular.

Because większy describes zakres, it has to agree with it in:

• gender
• number
• case

Since zakres is masculine singular nominative, the adjective is also masculine singular nominative:

• zakres
• większy

This is normal adjective agreement in Polish.

Większy is the comparative form meaning bigger / larger / greater.

In context, Polish often leaves the comparison unstated if it is obvious. So this sentence does not need to say explicitly:

• greater than before
• greater than previously expected
• greater than earlier in therapy

That comparison is understood from context.

This works much like English: you can say It’s better now without saying than before.

This is mainly about aspect and tense.

• zaczynać = imperfective
• zacząć = perfective

So:

• zaczynam = I am starting / I start
• zacznę = I will start

In this sentence, zaczynam presents the action as happening now or as part of a current process. That is why it is natural here.

If you used zacznę, it would usually mean I will start at some future point.

Because Polish usually leaves subject pronouns out when they are clear from the verb ending.

The ending -am in zaczynam already tells you the subject is I.

So:

• zaczynam = I start / I am starting

Adding ja is possible, but it gives extra emphasis, for example:

• Ja zaczynam... = I’m the one who starts... / As for me, I start...

Without emphasis, Polish normally omits the pronoun.

It is the direct object of zaczynam, so it is in the accusative.

However, for a neuter singular noun like ćwiczenie, the accusative looks the same as the nominative.

So:

• nominative: ćwiczenie
• accusative: ćwiczenie

The same is true for wzmacniające, which agrees with ćwiczenie.

That is why the whole phrase looks like the dictionary form, even though grammatically it is functioning as an object.

Wzmacniające comes from the verb wzmacniać = to strengthen.

Grammatically, it is a form that functions like an adjective, meaning something like:

• strengthening
• that strengthens

It agrees with ćwiczenie in gender, number, and case:

• ćwiczenie = neuter singular
• wzmacniające = neuter singular

So ćwiczenie wzmacniające means a strengthening exercise, literally an exercise that strengthens.

Adjectives often do come before the noun in Polish, but not always.

With forms like wzmacniające, putting them after the noun is very common, especially in more formal, technical, or descriptive language.

So:

• ćwiczenie wzmacniające sounds natural and somewhat technical
• wzmacniające ćwiczenie is also possible, but the rhythm and emphasis are a bit different

Post-position often feels a little more like classification: an exercise of the strengthening type.

Yes, but it would mean something different.

• zaczynam ćwiczenie wzmacniające = I start a strengthening exercise
• zaczynam ćwiczyć = I start exercising / I begin to exercise

So the original sentence talks about starting a specific exercise, not just beginning the activity of exercising in general.

Because Polish has no articles like English a and the.

So ćwiczenie wzmacniające can mean:

• a strengthening exercise
• the strengthening exercise

Which one is meant depends on context.

The same applies to zakres ruchu:

• the range of motion
• a range of motion

Polish relies on context instead of articles to show definiteness.

Yes, the singular is deliberate. It means one exercise.

• ćwiczenie wzmacniające = a strengthening exercise
• ćwiczenia wzmacniające = strengthening exercises

If the speaker means they are starting one specific exercise, the singular is correct. If they mean a set of strengthening exercises, the plural would be more natural.