Kalau saya duduk terlalu lama, pinggang saya jadi pegal.

Kalau means if or when, depending on context.

In Kalau saya duduk terlalu lama, pinggang saya jadi pegal, it introduces the condition:

• Kalau saya duduk terlalu lama = If/when I sit too long

In everyday Indonesian, kalau is very common and natural in speech. A more formal alternative is jika.

• Kalau saya duduk terlalu lama... = casual, everyday
• Jika saya duduk terlalu lama... = more formal

Indonesian often repeats the possessor where English would not.

So:

• saya duduk terlalu lama = I sit too long
• pinggang saya = my waist/lower back

Literally, the sentence is structured like:

• If I sit too long, my waist/lower back becomes sore.

Repeating saya is completely normal. Indonesian does not usually rely on possessive adjectives like English does in the same way across a whole sentence.

Pinggang literally often refers to the waist area, but in real usage it can also refer to the lower back or the area around the hips and waist.

In this sentence, pinggang saya jadi pegal is best understood as:

• my lower back gets sore
• my back starts aching around the waist area

A native English speaker might expect back rather than waist here, and that is often the more natural translation in context.

Here, jadi means become or end up.

So:

• pinggang saya jadi pegal = my lower back becomes sore
• more natural English: my lower back gets sore

Jadi is a very common Indonesian word with several meanings depending on context, such as:

• become
• so / therefore
• finished / done in some situations

But in this sentence, it clearly means become.

Pegal means something like:

• sore
• achy
• stiff from strain or overuse

It is not exactly the same as sakit.

• sakit = pain, hurt, painful, sick
• pegal = aching soreness, especially in muscles or the body after sitting too long, exercise, or physical strain

So pegal is more specific and often feels milder or more bodily/muscular than sakit.

For example:

• Badan saya pegal. = My body feels achy.
• Punggung saya sakit. = My back hurts.

Indonesian often does not use a verb equivalent to to be in the same way English does.

For example:

• Saya guru. = I am a teacher.
• Dia sakit. = He/she is sick.

In this sentence, the idea of becoming sore is expressed with jadi pegal, not with a separate word like is.

So Indonesian commonly leaves out to be where English requires it.

Terlalu lama means too long.

Breakdown:

• terlalu = too
• lama = long / a long time

So:

• duduk terlalu lama = sit too long
• literally, sit for too long a time

A few comparisons:

• lama = long
• terlalu lama = too long
• sudah lama = for a long time / already a long time

In Indonesian, time expressions often do not need a separate word like for.

So:

• duduk terlalu lama naturally means sit too long or sit for too long

Indonesian often expresses duration directly after the verb:

• Saya menunggu lama. = I waited a long time.
• Dia tidur terlalu lama. = He/she slept too long.

So the structure is very normal.

It can suggest either one, depending on context.

Kalau is flexible:

• if = conditional
• when = whenever this happens

So this sentence could mean:

• If I sit too long, my lower back gets sore.
• When I sit too long, my lower back gets sore.

If the speaker is describing a repeated personal experience, when may sound more natural in English. If they are speaking more hypothetically, if works well.

Yes, but the meaning changes a bit.

• punggung = back
• pinggang = waist/lower back area

So:

• Punggung saya jadi pegal = My back gets sore
• Pinggang saya jadi pegal = My lower back / waist area gets sore

If the discomfort is specifically in the lower back, pinggang is a good choice.

The given order is very natural:

• Kalau saya duduk terlalu lama, pinggang saya jadi pegal.

You could also hear variations like:

• Pinggang saya jadi pegal kalau saya duduk terlalu lama.

This means the same thing:
My lower back gets sore if I sit too long.

Both are correct. The version starting with kalau puts the condition first.

It sounds natural and neutral, leaning toward everyday spoken Indonesian.

Why:

• kalau is common in speech
• jadi pegal sounds conversational and natural

It is not slang, and it is not rude. It is perfectly fine in daily conversation.

A slightly more formal version might be:

• Jika saya duduk terlalu lama, pinggang saya menjadi pegal.

Here:

• jika is more formal than kalau
• menjadi is a more formal alternative to jadi

Yes, and in many cases gets sore is the most natural English translation.

• jadi literally = become
• natural English = often get

So:

• pinggang saya jadi pegal = my lower back gets sore

This is a good example of translating naturally rather than word-for-word.

Sometimes yes, if the context is clear.

For example, in conversation someone might say:

• Kalau duduk terlalu lama, pinggang jadi pegal.

This can mean:

• If you sit too long, your lower back gets sore
• If I sit too long, my lower back gets sore
• or even a general statement, depending on context

But the full version with saya twice is clearer and very natural.

Yes — this sentence shows several very useful Indonesian patterns:

1. Kalau for if/when
2. Verb + duration:
   • duduk terlalu lama = sit too long
3. Body-part possession:
   • pinggang saya = my lower back/waist
4. jadi for become/get
5. pegal for achy/sore/stiff

So this one sentence is a great model for building similar sentences, such as:

• Kalau saya berdiri terlalu lama, kaki saya jadi pegal.
  If I stand too long, my legs get sore.

• Kalau saya kerja terlalu lama, badan saya jadi pegal.
  If I work too long, my body gets achy.