Learn Hardcore Korean: jeoneun daebubun gongwoneseo undonghaeyo.

는 marks the topic (“as for me”). You’re introducing yourself as the topic of the sentence.
제가 uses the subject marker 가 and emphasizes “I (as opposed to someone else) am the one who…”, often to answer “who?”.
Use 는 for a neutral statement about your habits; use 제가 when you need to highlight or contrast the doer.
Form tip: use 는 after a vowel (저는), 은 after a consonant (학생은).

Can I drop 저는?

Yes. If it’s clear from context that you’re talking about yourself, you can omit it: 대부분 공원에서 운동해요.
Keep 저는 when you need contrast or to (re)establish the topic.

Why is it 공원에서 and not 공원에?

에서 marks the place where an action happens. 운동하다 is an action, so use 에서.
에 marks destination or a static location/existence.
Examples:
- 공원에서 운동해요. = I exercise at the park.
- 공원에 가요. = I go to the park.
- 공원에 있어요. = I’m at the park.

Is “공원에 운동해요” grammatical?

What exactly does 대부분 mean here?

Here 대부분 functions as an adverb meaning “mostly/for the most part.”
It is not “most parks.” To modify a noun, use 대부분의 + noun: 대부분의 공원 = most parks.

Can I say “대부분은 공원에서 운동해요”? What’s the nuance?

Yes. Adding 는 makes “most (of the time/instances)” a contrastive topic, implying exceptions.
Nuance: “Most of the time, I exercise at the park (though not always).”

Where can I put 대부분 in the sentence? Does position change the meaning?

저는 대부분 공원에서 운동해요. = Of the times I exercise, most are at the park. (default reading)
저는 공원에서 대부분 운동해요. = At the park, I mostly exercise (rather than doing other things there).
대부분은 공원에서 운동해요. = As for most cases, it’s at the park (contrastive).
All are grammatical; choose based on what you want to emphasize.

Should it be 운동해요 or 운동을 해요?

Both are correct and near-equivalent: 운동해요 = 운동을 해요.
Many 하다-compounds work both ways (e.g., 공부해요 = 공부를 해요). The version without 을/를 is just a bit leaner.

What’s the politeness level of 운동해요, and how else can I say this?

운동해요 is polite informal (해요-style), good for everyday conversation.
Variants:
- Casual: 운동해; with casual pronoun: 나는 대부분 공원에서 운동해.
- Formal polite: 운동합니다; full: 저는 대부분 공원에서 운동합니다.

Can I use 나 instead of 저?

Yes, but only in casual speech: 나는 대부분 공원에서 운동해.
Avoid mixing levels (e.g., 나는 … 운동해요). Keep pronouns and endings consistently casual or polite.

Is the spacing correct? Should it be 운동 해요?

Write 운동해요 as one word (no space). 하다-compounds are written together when conjugated.
Other parts are also single units: 공원에서, 저는, 대부분.

How do you pronounce the whole sentence naturally?

Romanization: jeoneun daebubun gongwon-eseo undonghaeyo.
Note the glide: 공원에서 sounds like “공워네서” (원 + 에 → 워네). The rest is pronounced as written.

How do I say it in the past or future?

Is there a more colloquial word than 대부분 for “mostly”?

Can I add 는 to 공원에서 for emphasis?

Yes: 공원에서는 운동해요. Adding -은/는 after 에서 contrasts the park with other places (“At the park, I (do) exercise …”).

Could I say “대부분의 공원에서 운동해요”? What would that mean?

That means “I exercise at most parks” (i.e., at many different parks). It’s about the number of parks, not how often you go.
For “mostly, I exercise at the park,” use 대부분/주로 with the verb, not 대부분의.

What about “운동을 대부분 해요”? Is that the same?

Different focus. 운동을 대부분 해요 = “What I mostly do (in that context) is exercise,” contrasting exercise with other activities.
대부분 공원에서 운동해요 focuses on where you exercise most of the time (the park).

Any tips for building out the sentence naturally?

Add time expressions before place: 저는 보통 아침에 공원에서 운동해요. / 주말에는 공원에서 운동해요.
Typical order is flexible, but a common pattern is Topic – (frequency) – time – place – verb.