O treino começa com o aquecimento.

Here, treino means training, workout, or practice session, depending on context.

In Brazilian Portuguese, treino is very common in sports, fitness, and exercise contexts:

• o treino de hoje = today’s workout/training session
• depois do treino = after training / after the workout

A related word is treinamento, which often sounds a bit more formal or structured, like training in a broader sense.

Because both treino and aquecimento are masculine singular nouns, so they take the masculine singular definite article o.

• o treino
• o aquecimento

In Portuguese, nouns have grammatical gender, so you usually need to learn the noun together with its article.

Começa comes from the verb começar, which means to begin or to start.

This form is:

• 3rd person singular
• present tense

So:

• o treino começa = the workout begins / starts

A quick mini-conjugation:

• eu começo = I start
• você começa = you start
• ele/ela começa = he/she starts

The ç is called cedilha.

It shows that the c is pronounced like an s sound before a, o, or u.

So:

• começa sounds like ko-MEH-sa

Without the cedilla, ca would normally sound like kah, not sa.

This is why you also see:

• começar
• almoço
• coração

Because Portuguese uses começar com to mean to start with.

So:

• começar com algo = to start with something

Examples:

• A aula começa com uma revisão. = The class starts with a review.
• O treino começa com o aquecimento. = The workout starts with the warm-up.

This is a very natural pattern in Portuguese.

Because in standard Portuguese, com usually does not contract with the article o in writing.

So you write:

• com o
• com a
• com os
• com as

Unlike:

• de + o = do
• em + o = no
• a + o = ao

There are some old or literary forms like co, coa, cos, coas, but they are not standard in normal modern Brazilian Portuguese.

Literally, aquecimento comes from aquecer, meaning to warm or to heat.

So aquecimento literally means something like:

• warming
• heating
• warm-up

In exercise contexts, it means warm-up.

Related words:

• aquecer = to warm up / to heat
• aquecido = warmed/heated

Yes, you can, and it sounds natural.

There is a small nuance:

• começa com o aquecimento = starts with the warm-up
• começa pelo aquecimento = starts with / by doing first the warm-up

Pelo can make it feel a little more like the first step is the warm-up.

Both are good, but começa com o aquecimento is very straightforward and common.

Portuguese uses articles more often than English does.

So even when English leaves articles out, Portuguese often keeps them:

• O treino
• o aquecimento

In this sentence, the articles make it sound natural and complete in Portuguese. Without them, the sentence would sound odd or incomplete in most normal contexts:

• Treino começa com aquecimento → not the standard natural version here

It can be understood either way, depending on context.

• In a specific context: The workout starts with the warm-up.
• In a more general/instructional context: A workout starts with a warm-up or Training starts with a warm-up.

Portuguese often uses the definite article for general statements too, not just for specific things.

A helpful approximate pronunciation in Brazilian Portuguese is:

oo TREY-noh ko-MEH-sa kong oo ah-keh-see-MEN-too

A few notes:

• O = often sounds like oo
• treino = roughly TREY-noh
• começa = ko-MEH-sa
• com o = often flows together in speech
• aquecimento = ah-keh-see-MEN-too

The exact pronunciation can vary a bit by region.

The sentence follows the very common Portuguese pattern:

subject + verb + prepositional phrase

• O treino = subject
• começa = verb
• com o aquecimento = prepositional phrase

This is the most neutral and natural order.

You could change the order for emphasis, but the original is the standard, simple version.

Yes, if the meaning changes.

Singular:

• O treino começa com o aquecimento. = The workout starts with the warm-up.

Plural:

• Os treinos começam com aquecimento. = Workouts start with warm-up.
• Os treinos começam com o aquecimento. = The workouts start with the warm-up.

In real usage, the singular version is very common when talking about the general structure of a training session.

Both can relate to training, but they are not always used in exactly the same way.

Treino often means:

• a workout
• a practice session
• a training session

Treinamento often means:

• training as a process
• a formal training program
• professional or organized training

Examples:

• Vou para o treino. = I’m going to practice / to my workout.
• A empresa oferece treinamento. = The company offers training.

In your sentence, treino is the most natural choice for a workout or exercise session.