मैं फिट हूँ और मेरे पास बहुत ऊर्जा है।

In normal Hindi word order, the adjective usually comes before the form of होना (to be).

So:

• मैं फिट हूँ = I am fit
• literally: I fit am

मैं हूँ फिट is not the usual neutral word order. It might sound poetic, emphatic, or unnatural in everyday speech.

Yes. फिट is a very common borrowed word in modern Hindi, especially in speech. It usually means:

• fit
• healthy
• in good shape

So मैं फिट हूँ is very natural in conversational Hindi.

Depending on context, you could also hear:

• मैं स्वस्थ हूँ = I am healthy
• मैं तंदुरुस्त हूँ = I am healthy / fit

But फिट is common and easy to understand.

हूँ is the first-person singular present form of होना (to be), used with मैं (I).

So:

• मैं हूँ = I am

In your sentence:

• मैं फिट हूँ = I am fit

Some other present-tense forms of होना are:

• मैं हूँ = I am
• तुम हो = you are
• वह है = he/she/it is
• हम हैं = we are
• वे हैं = they are

Hindi usually expresses possession with X के पास Y है, which literally means something like:

• Y is near/with X
• or more naturally: X has Y

So:

• मेरे पास बहुत ऊर्जा है
  literally: Near me/with me there is a lot of energy
  natural English: I have a lot of energy

This is one of the most common ways Hindi says have.

Examples:

• मेरे पास समय है। = I have time.
• उसके पास कार है। = He/She has a car.
• हमारे पास पैसा नहीं है। = We do not have money.

Because पास is a postposition, and Hindi pronouns change form before postpositions.

With मैं, the basic form is:

• मैं = I

But before a postposition, it changes to its oblique form:

• मेरे
  • पास = मेरे पास

So:

• मेरे पास = with me / I have

Compare:

• मेरा घर = my house
• मेरे पास घर है = I have a house

Even though मेरे can also mean my in some contexts, here it is part of the fixed possessive structure मेरे पास.

Because the second part is built differently.

First part:

• मैं फिट हूँ
  Here the subject is मैं, so the verb is हूँ.

Second part:

• मेरे पास बहुत ऊर्जा है
  In this possession structure, the verb agrees with the thing being possessed, here ऊर्जा.

Since ऊर्जा is singular, Hindi uses है.

So the two parts are:

• मैं फिट हूँ = I am fit
• मेरे पास बहुत ऊर्जा है = I have a lot of energy

Because ऊर्जा is singular.

• ऊर्जा = energy

So:

• बहुत ऊर्जा है = there is a lot of energy / I have a lot of energy

If the possessed thing were plural, you would often use हैं:

• मेरे पास बहुत किताबें हैं। = I have many books.

But ऊर्जा is an uncountable singular noun here, so है is correct.

बहुत means a lot, very much, or many, depending on context.

Here it modifies ऊर्जा:

• बहुत ऊर्जा = a lot of energy

So:

• मेरे पास बहुत ऊर्जा है = I have a lot of energy

Hindi usually puts बहुत before the noun it modifies:

• बहुत पानी = a lot of water
• बहुत समय = a lot of time
• बहुत दोस्त = many friends

Yes, depending on context.

Your sentence literally says:

• मैं फिट हूँ और मेरे पास बहुत ऊर्जा है।
• I am fit and I have a lot of energy.

A more natural English-style idea might be I am fit and energetic, but Hindi is expressing it with the possession structure.

A more direct Hindi way to say I am energetic would be:

• मैं ऊर्जावान हूँ।

That said, मेरे पास बहुत ऊर्जा है is perfectly correct and natural.

Yes. That would mean:

• मैं फिट और ऊर्जावान हूँ।
• I am fit and energetic.

This version is more compact because both qualities are attached directly to मैं.

Compare:

• मैं फिट हूँ और मेरे पास बहुत ऊर्जा है।
  = I am fit and I have a lot of energy.
• मैं फिट और ऊर्जावान हूँ।
  = I am fit and energetic.

Both are good; they just phrase the idea differently.

Yes. और is the standard word for and in Hindi.

So:

• मैं फिट हूँ और मेरे पास बहुत ऊर्जा है।
• I am fit and I have a lot of energy.

It links the two clauses just like and in English.

Yes, and in fact that is exactly what happens.

The sentence does not repeat मैं in the second clause. Instead it uses:

• मेरे पास = with me / I have

That already makes the person clear.

Hindi often avoids repeating the full subject when it is already obvious.

For example:

• मैं फिट हूँ और मेरे पास बहुत ऊर्जा है।
• You do not need: मैं फिट हूँ और मैं के पास... — that would be wrong.

So the sentence is already natural and efficient.

ऊर्जा is pronounced roughly like oor-jaa.

A simple breakdown:

• ऊर ≈ oor
• जा ≈ jaa

So: oor-jaa

Also, हूँ has a nasal sound at the end. It is roughly:

• hoon with nasalization

It is understandable and mostly natural, especially in modern spoken Hindi.

• मैं फिट हूँ is very natural.
• मेरे पास बहुत ऊर्जा है is grammatically correct and natural enough.

If someone wanted a slightly smoother everyday version, they might also say:

• मैं फिट हूँ और बहुत ऊर्जावान महसूस करता/करती हूँ।
• मैं फिट हूँ और मुझमें बहुत ऊर्जा है।
• मैं फिट और ऊर्जावान हूँ।

But your original sentence is absolutely fine for a learner and communicates the meaning clearly.