Он успел хорошо распариться.

Успел + infinitive means managed to do something or had time to do something before some limit.

So Он успел хорошо распариться does not just say that he got steamed up thoroughly. It adds the idea that this happened in time, before something else interrupted or before some situation changed.

A simple past verb would describe the event itself. Успел adds the nuance of success before a deadline or cutoff.

Because in the past tense, Russian verbs agree with the subject in gender and number.

Here the subject is он, so the past form is:

• успел — masculine singular
• успела — feminine singular
• успело — neuter singular
• успели — plural

Since the sentence starts with Он, успел is the only correct form.

Because успеть normally takes an infinitive to say what someone managed to do.

So the structure is:

• успел — finite verb, past tense
• распариться — infinitive, the action he managed to complete

This is very common in Russian:

• Он успел поесть — He managed to eat
• Она успела уйти — She managed to leave
• Мы успели закончить — We managed to finish

So Он успел хорошо распариться follows a very standard pattern.

Распариться is a perfective verb. Here that makes sense because the sentence focuses on reaching the result/state: he got himself thoroughly steamed up.

Compare the general idea:

• париться — to steam oneself, be in the steam bath, undergo the process
• распариться — to get thoroughly steamed up, reach that state

After успеть, perfective is often very natural when the idea is managing to achieve a completed result.

So this sentence is not about the ongoing process as such. It is about the fact that he succeeded in getting properly steamed up.

The prefix раз- often adds a sense of intensity, thoroughness, or reaching a strong state.

So распариться is stronger and more result-focused than just париться.

It suggests something like:

• get thoroughly steamed
• get fully warmed up by steam
• get properly softened/heated by the steam

In other words, he did not merely sit in steam; he got into that fully steamed-up condition.

The -ся ending is the reflexive marker, but it does not always translate neatly as himself.

In this sentence, it helps make the verb mean that the subject undergoes the change of state. He becomes steamed up; the action affects him.

So распариться is not exactly word-for-word steam himself in the English sense. It is more natural to think of it as:

• get steamed up
• get thoroughly warmed by steam

So yes, it is reflexive in form, but English usually translates the whole verb more naturally than translating -ся separately.

Here хорошо means something like:

• well
• properly
• nicely
• thoroughly

It does not mean morally good. It describes the degree or quality of the result.

So хорошо распариться means he got steamed up properly or really well.

In English, depending on context, it may sound more natural as thoroughly than simply well.

Grammatically, париться and распариться are related, but they are not interchangeable here.

• париться focuses more on the process
• распариться focuses on the resulting state

Because the sentence uses успел and describes a successful completed outcome, распариться is the more natural choice.

If you used париться, it would sound more like he had time to be steaming / to steam himself, not specifically that he reached the state of being thoroughly steamed up.

Usually, yes. That is one of the key meanings of успеть.

The sentence often implies something like:

• before leaving
• before the bath cooled down
• before someone arrived
• before they had to go

Russian does not have to state that limit explicitly. It can remain understood from context.

So even if no deadline is named, успел strongly suggests there was limited time and he managed it.

Yes to both, depending on context.

1. Can он be omitted?

Russian often drops subject pronouns when the subject is clear from context. So in a conversation, you might hear just:

• Успел хорошо распариться.

But as a standalone sentence, он is natural because it tells you explicitly who did it.

2. Can the word order change?

Yes, Russian word order is flexible. The neutral order here is:

• Он успел хорошо распариться.

Other orders are possible for emphasis, for example:

• Хорошо распариться он успел.

That puts more emphasis on хорошо распариться.

So the original sentence is the most neutral and standard version.

Most naturally, yes: it strongly suggests a steam bath / sauna / hot bath type of context, especially something like a баня.

It refers to becoming very warm, softened, and steamed through.

Depending on context, Russian verbs from this family can sometimes be used more loosely for becoming overheated, but in this sentence the most natural reading is the literal physical one.