L'esercizio fisico migliora la salute.

Because esercizio starts with a vowel. In Italian, the singular definite article before a vowel is usually l'.

So:

• l'esercizio = the exercise

You do not say il esercizio.

A few related examples:

• l'amico = the friend
• l'idea = the idea
• l'uomo = the man

Here, fisico is an adjective meaning physical.

So:

• esercizio fisico = physical exercise

In other contexts, fisico can also be a noun or adjective with other meanings, such as:

• il fisico = physique/body build
• fisico = physical, bodily

But in this sentence, it simply describes esercizio.

In Italian, adjectives often come after the noun, much more often than in English.

So:

• esercizio fisico literally follows the pattern exercise physical

This is completely normal Italian word order.

Not every adjective always comes after the noun, but with a straightforward descriptive adjective like fisico, post-noun position is the standard choice.

Migliora is the third-person singular present tense of migliorare.

The subject is l'esercizio fisico, which is singular, so the verb must also be singular.

Conjugation of migliorare in the present:

• io miglioro = I improve
• tu migliori = you improve
• lui/lei migliora = he/she improves
• l'esercizio fisico migliora = physical exercise improves

So migliora is the correct form for it improves.

It can mean either one, depending on context.

In this sentence, the most natural meaning is:

• Physical exercise improves health

Italian present tense often covers both:

• simple present: improves
• present progressive in some contexts: is improving

If you specifically wanted to emphasize is improving right now, Italian often uses:

• sta migliorando

But here, migliora is best understood as a general truth.

Italian often uses the definite article where English does not, especially with general or abstract ideas.

So:

• la salute = health / the health

In this sentence, la salute means health in general, not necessarily one specific person's health.

This is very common in Italian. For example:

• La musica mi piace. = I like music.
• Il vino rosso fa bene. = Red wine is good for you.

So even though English says health with no article, Italian naturally says la salute.

Yes, salute is feminine, which is why it takes la:

• la salute

You often learn noun gender together with the article, so it is best to memorize it as:

• la salute

The ending -e does not automatically tell you whether a noun is masculine or feminine, so the article is especially helpful here.

A key point is the gli sound, which is tricky for English speakers.

migliora is pronounced approximately:

• mee-LYAW-ra

More carefully:

• the gli in many words sounds like a soft ly sound
• the stress is on -o-: mi-gli-O-ra

So it is mi-lyo-ra, not mig-lee-or-a.

A similar sound appears in:

• famiglia
• figlio
• moglie

A good approximate pronunciation is:

• eh-zer-CHEE-tsyo

A few details:

• the stress is on -ci-: esercizio
• z here sounds like ts
• cio here is part of the sound tsyo

So try to avoid pronouncing it like English exercise. The Italian word has its own sound pattern.

Yes, that is also a correct sentence, but it means something slightly different in structure.

• L'esercizio fisico migliora la salute = Physical exercise improves health.
• La salute migliora con l'esercizio fisico = Health improves with physical exercise.

The original sentence focuses on exercise as the thing doing the improving.
The second version focuses on health as the thing that gets better.

Both are natural, but they are not structured in exactly the same way.

No. It is a very clear and standard way to say physical exercise, but you may also hear:

• fare esercizio = to exercise
• fare attività fisica = to do physical activity
• allenarsi = to train / work out

So:

• L'esercizio fisico migliora la salute is correct and natural.
• In everyday speech, people might also say things like Fare attività fisica fa bene alla salute.

Yes, that is grammatically correct, but it means something a little different.

• L'esercizio fisico migliora la salute = Physical exercise improves health.
  
  • This is a general concept: exercise as an activity.
• Gli esercizi fisici migliorano la salute = Physical exercises improve health.
  
  • This sounds more like individual exercises or kinds of exercises.

So the singular in the original sentence is used to talk about exercise in a broad, general sense.

Yes. This is a very common use of the present tense in Italian: stating something generally true or usually true.

So L'esercizio fisico migliora la salute is understood like:

• Exercise improves health.
• Physical exercise is good for health.

It is not necessarily talking about one specific workout happening right now. It is a general statement.