undongeul hamyeon himi saenggipnida.

Both are possible.

• 운동을 하면 = if/when you do exercise
• 운동하면 = a shorter version that comes from 운동하다
  • -면

Why the difference?

• 운동 is a noun meaning exercise
• 하다 turns it into a verb: 운동하다 = to exercise
• In 운동을 하다, the particle 을 marks 운동 as the object of 하다

So 운동을 하면 is literally if you do exercise.

In natural Korean, speakers often also say 운동하면. The version with 을 can sound a little more explicit or slightly more careful, but both are normal.

-면 means if or when, depending on context.

So:

• 운동을 하면 = if you exercise / when you exercise

In this sentence, it expresses a general result:

• If/when you exercise, strength develops
• More naturally in English: Exercise gives you strength or If you exercise, you get stronger

This is a very common pattern in Korean:

• 먹으면 = if/when you eat
• 가면 = if/when you go
• 공부하면 = if/when you study

Because 생기다 is an intransitive verb.

생기다 means things like:

• to arise
• to appear
• to form
• to come into being
• to develop

So 힘이 생기다 literally means strength comes into existence or strength develops.

That makes 힘 the subject of the verb, so it takes 이/가, not 을/를.

Compare:

• 힘이 생깁니다 = strength develops / you gain strength
• not 힘을 생깁니다 because 생기다 does not take a direct object here

생깁니다 is the polite formal present-tense form of 생기다.

Depending on context, 생기다 can mean:

• to be formed
• to arise
• to occur
• to appear
• to develop

In 힘이 생깁니다, the most natural English meaning is:

• you gain strength
• strength develops
• you become stronger
• sometimes you gain energy

So even though the literal idea is strength comes into being, the natural meaning is something like exercise makes you stronger.

Here, 힘 most naturally means strength or energy.

It is a broad word, and depending on context it can mean:

• physical strength
• energy
• power
• force
• ability to keep going

In a sentence about exercise, English speakers usually understand it as:

• strength
• stamina
• energy

So 운동을 하면 힘이 생깁니다 suggests that exercise gives you more physical power or vitality.

Yes. Korean often leaves out the subject when it is obvious from context.

So this sentence can mean:

• If you exercise, you gain strength
• If people exercise, they gain strength
• Exercise gives one strength

Korean does not need to say you explicitly here. The sentence is making a general statement, so the subject is understood.

Because Korean normally puts background or condition first, and the main result later.

Structure:

• 운동을 하면 = if/when you exercise
• 힘이 생깁니다 = strength develops

This order is very natural in Korean:

• condition first
• result second

It is similar to saying in English:

• If you exercise, you gain strength

Korean is also a verb-final language, so the main verb usually comes at the end of each clause.

생깁니다 is in the formal polite style, often called the -ㅂ니다/습니다 style.

This style is common in:

• textbooks
• presentations
• announcements
• news
• formal explanations
• health advice

Less formal versions would be:

• 운동을 하면 힘이 생겨요 = polite everyday speech
• 운동하면 힘이 생겨 = casual speech

So the sentence sounds polite and somewhat formal, which is very common in learning materials.

More or less, yes.

A very literal breakdown is:

• 운동 = exercise
• 을 = object marker
• 하다 = to do
• -면 = if/when

So:

• 운동을 하면 = if one does exercise

But natural English does not usually say do exercise in the same way. We usually translate it as:

• if you exercise
• when you exercise

So the Korean structure is more literal than the natural English translation.

Yes. The Korean -면 often covers both ideas.

In English:

• if can sound conditional
• when can sound more like a regular or expected situation

In Korean, -면 can express either depending on context. In this sentence, it gives a general truth:

• If/when you exercise, you gain strength

So both are reasonable ways to understand it.