Zakres ruchu jest większy dzięki temu, że regularnie rozciągam mięsień.

Literally, zakres ruchu means range of movement.

• zakres = range, scope
• ruchu = of movement / of motion

In natural English, this is usually translated as range of motion.

Because ruchu is the genitive singular form of ruch.

In Polish, when one noun describes another noun in a phrase like range of motion, the second noun is often put in the genitive case.

So:

• ruch = motion, movement
• zakres ruchu = range of motion

This is very common in Polish:

• koniec dnia = end of the day
• początek filmu = beginning of the film
• zakres ruchu = range of motion

Większy means bigger / greater, and it agrees with zakres, which is a masculine singular noun.

So:

• zakres is masculine
• therefore the adjective must also be masculine singular: większy

Compare:

• Ten zakres jest większy. = This range is greater.
• Ta książka jest większa. = This book is bigger.
• To okno jest większe. = This window is bigger.

The ending changes depending on the gender of the noun.

Dzięki temu, że means something like:

• thanks to the fact that
• because
• due to the fact that

In this sentence, it introduces the reason:

• Zakres ruchu jest większy dzięki temu, że...
• The range of motion is greater because / thanks to the fact that...

It is built from:

• dzięki = thanks to
• temu = this/that, in the dative form
• że = that

So the whole phrase literally works like thanks to this, that..., but in natural English we usually simplify it.

Because in Polish, że usually introduces a subordinate clause, and that clause is normally separated by a comma.

Here:

• Zakres ruchu jest większy dzięki temu, że regularnie rozciągam mięsień.

The part after że is a full clause:

• regularnie rozciągam mięsień = I regularly stretch the muscle

So the comma is required.

This is very typical in Polish:

• Wiem, że masz rację. = I know that you are right.
• Cieszę się, że przyszedłeś. = I’m glad that you came.

Rozciągam is imperfective, and that fits the meaning here because the action is:

• repeated
• habitual
• ongoing in a general sense

The sentence says:

• regularnie rozciągam mięsień = I stretch the muscle regularly

Whenever you talk about something you do regularly, Polish usually uses the imperfective aspect.

So:

• rozciągam = I am stretching / I stretch regularly
• a perfective form would suggest a completed single action, which does not fit as well here

For habitual actions, imperfective is the normal choice.

Regularnie means regularly.

It tells us how often or in what pattern the action happens.

So:

• regularnie rozciągam mięsień = I stretch the muscle regularly

It suggests a repeated habit, not just a one-time action.

Here mięsień is the direct object of rozciągam, so it is in the accusative case.

But for many masculine inanimate nouns in Polish, the accusative singular is the same as the nominative singular.

So:

• nominative: mięsień
• accusative: mięsień

That is why the form does not change.

Compare:

• Widzę stół. = I see the table.
  (stół stays the same in the accusative)
• Widzę psa. = I see the dog.
  Here it changes because pies is masculine animate

Since mięsień is inanimate, mięsień is correct.

Grammatically, the singular is correct. But in real-life usage, Polish speakers might often say the plural if they mean muscles in general.

For example:

• regularnie rozciągam mięśnie = I regularly stretch my muscles

The singular mięsień sounds most natural if:

• you are talking about one specific muscle
• the context already makes it clear which muscle you mean

So the sentence is correct, but depending on context, mięśnie might sound more natural.

Yes. Polish has several ways to express this idea.

Possible alternatives include:

• bo = because
• ponieważ = because / since
• dlatego że = because
• dzięki regularnemu rozciąganiu mięśnia = thanks to regular stretching of the muscle

For example:

• Zakres ruchu jest większy, bo regularnie rozciągam mięsień.
• Zakres ruchu jest większy, ponieważ regularnie rozciągam mięsień.

These are slightly different in tone:

• bo is more conversational
• ponieważ is a bit more formal
• dzięki temu, że emphasizes a positive cause

Temu is in the dative case.

That is because dzięki requires the dative.

So:

• dzięki komu? czemu? = thanks to whom? thanks to what?
• dzięki temu = thanks to this / thanks to that

You can see the same pattern in:

• dzięki tobie = thanks to you
• dzięki pracy = thanks to work
• dzięki temu = thanks to this

So temu is not random — it is there because dzięki governs the dative case.

Yes, Polish word order is flexible, though some versions sound more natural than others.

The original:

• Zakres ruchu jest większy dzięki temu, że regularnie rozciągam mięsień.

You could also say:

• Dzięki temu, że regularnie rozciągam mięsień, zakres ruchu jest większy.

This version puts the reason first.

Both are correct. The difference is mainly about emphasis:

• original order: first states the result
• reordered version: first states the cause

In the present tense, Polish often omits to be in some sentence types, but here jest is needed.

Why?

Because większy is functioning as a predicate adjective:

• Zakres ruchu jest większy. = The range of motion is greater.

Without jest, the sentence would sound incomplete or unnatural in standard Polish.

So here:

• jest = is
• większy = greater

Together they form the normal present-tense structure.

Most naturally, it sounds like a general fact about the speaker’s condition or progress.

Because of regularnie rozciągam, the sentence suggests:

• an ongoing habit
• a repeated action
• a continuing result

So the meaning is something like:

• My range of motion is greater because I regularly stretch this muscle.

It does not sound like a one-time event. It sounds more like explanation of a routine and its effect.