Depois do treino, eu massajo o pulso e a minha irmã massaja o pescoço.

Because do is the normal contraction of de + o.

• de = of / from / after in this kind of structure
• o treino = the training / the workout

So:

• depois de o treino → contracts to depois do treino

This kind of contraction is extremely common in Portuguese:

• de + a = da
• de + o = do
• em + a = na
• em + o = no

So depois do treino is the natural, correct form.

Because Depois do treino is an introductory time phrase: it sets the scene before the main clause.

So the sentence is structured like this:

• Depois do treino, = time frame
• eu massajo o pulso e a minha irmã massaja o pescoço. = main information

In writing, that comma is very natural and helps readability. In short sentences, some commas around introductory phrases can be optional, but here it is a very normal choice.

Yes, Portuguese often omits subject pronouns because the verb ending already shows the person.

So you could also say:

• Depois do treino, massajo o pulso...

That would still clearly mean I massage my wrist because massajo is the eu form.

However, eu is not wrong at all. It may be included for:

• clarity
• emphasis
• contrast with another subject later in the sentence

Here there is a contrast between:

• eu massajo...
• a minha irmã massaja...

So keeping eu makes that contrast a bit clearer.

Because the verb changes according to the subject.

The infinitive is massajar.

Present tense:

• eu massajo = I massage
• tu massagens = you massage
• ele/ela/você massaja = he/she/you massage
• nós massajamos = we massage
• eles/elas/vocês massajam = they/you massage

So in the sentence:

• eu massajo → first person singular
• a minha irmã massaja → third person singular

That is why the endings are different.

Yes. Massajar is a normal verb meaning to massage.

Its present-tense forms are regular for an -ar verb, with the expected endings:

• -o for eu
• -a for ele/ela/você

So:

• massaj-o
• massaj-a

The spelling stays with j, because the verb already has j in the stem: massaj-.

In European Portuguese, it is very common to use the definite article before a possessive:

• a minha irmã = my sister
• o meu irmão = my brother
• a minha mãe = my mother

So a minha irmã is the standard, very natural European Portuguese form.

You may sometimes see possessives without the article in other contexts or varieties, but for Portuguese from Portugal, a minha irmã is exactly what learners should expect most of the time.

Portuguese often uses the definite article with body parts when the owner is already clear from the context.

So:

• eu massajo o pulso naturally means I massage my wrist
• a minha irmã massaja o pescoço naturally means my sister massages her neck

Because the subject already tells you whose body part it is, a possessive is often unnecessary.

This is very common in Portuguese and can feel different from English, which usually prefers:

• my wrist
• her neck

Portuguese can use possessives too, but here the article-only version is very natural.

Yes. Pulso can also mean pulse.

So depending on context, pulso may refer to:

• the wrist
• the pulse

In this sentence, because of massajo o pulso, the intended meaning is most naturally wrist.

If someone were checking your heartbeat, then pulso could be understood as pulse instead.

Treino usually means training, practice, or workout, depending on context.

So depois do treino could mean:

• after training
• after practice
• after the workout

The exact English word depends on the situation:

• sport practice
• gym training
• exercise session
• some other type of training

In everyday Portuguese, treino is very common for sports and fitness contexts.

The letter ç is pronounced like an s sound.

So in pescoço:

• ç = s

A helpful learner-friendly pronunciation guide would be something like:

• pesh-KO-su in European Portuguese

A few key points:

• the s before a consonant often sounds like sh in European Portuguese
• the ç always gives an s sound
• the final o in European Portuguese is often reduced, sounding closer to u

So pescoço does not sound like a hard k at the ç; it is an s sound.

Yes, absolutely.

You could say:

• Depois do treino, massajo o pulso e a minha irmã massaja o pescoço.

That is perfectly grammatical and very natural, because massajo already tells us the subject is eu.

Including eu simply adds a bit more explicitness or contrast. So both are correct:

• Depois do treino, eu massajo...
• Depois do treino, massajo...

Yes, Portuguese word order is flexible, although some versions sound more neutral than others.

The original sentence is very natural:

• Depois do treino, eu massajo o pulso e a minha irmã massaja o pescoço.

You could also say:

• Eu massajo o pulso depois do treino, e a minha irmã massaja o pescoço.

That is also grammatical, but it slightly changes the rhythm and focus.

The original version is especially natural because it starts with the time phrase and then gives the two actions.