Efter træningen drikker jeg vand og hviler mig.

Træningen is the definite form of træning, so it means the training / the workout / the exercise session.

In this sentence, Efter træningen means after the training session or after the workout.

Compare:

• efter træningen = after the workout / after that training session
• efter træning = after training / after exercise, more general

So the -en ending is doing the job that the would do in English.

This is because Danish follows the V2 rule in main clauses. That means the finite verb normally comes in second position.

The sentence starts with Efter træningen, which takes the first position. So the verb has to come next:

• Efter træningen = position 1
• drikker = position 2
• jeg = then the subject comes after the verb

So:

• Jeg drikker vand efter træningen. = neutral order
• Efter træningen drikker jeg vand. = same meaning, but with after the workout emphasized first

This is very common in Danish.

It can mean both, depending on context.

In English, training can sound broad or abstract, while in Danish træningen often refers very naturally to a specific training session, practice, or workout.

So in this sentence, a learner should understand it as something like:

• the workout
• the training session
• practice, if the context is sports

Because vand is an uncountable noun here, like water in English.

In English, we say:

• I drink water

not usually I drink a water, unless we mean a bottle/glass/serving.

Danish works the same way:

• jeg drikker vand = I drink water

If you wanted to talk about a specific amount or serving, you could say something like:

• jeg drikker et glas vand = I drink a glass of water

Because the usual way to say rest in this sense is hvile sig.

So:

• jeg hviler mig = I rest / I am resting

This is a reflexive expression, where the action comes back to the subject.

Just hvile by itself often has other uses, for example:

• to rest physically on something
• to lie still
• in some contexts, even to be buried / rest

So for everyday I rest after exercise, hvile sig is the natural choice.

Because Danish uses different reflexive pronouns depending on the person.

For first and second person, Danish uses the normal object pronouns:

• jeg vasker mig = I wash myself
• du vasker dig = you wash yourself
• vi vasker os = we wash ourselves

But for the third person, Danish usually uses sig:

• han vasker sig = he washes himself
• hun hviler sig = she rests

So in this sentence, since the subject is jeg, the correct form is mig.

Because Danish can leave out the subject in the second part when it is the same subject and the structure is clear.

So:

• Efter træningen drikker jeg vand og hviler mig.

means:

• After the workout, I drink water and rest.

You could also say:

• Efter træningen drikker jeg vand, og jeg hviler mig.

But that sounds a bit heavier here. Omitting the repeated jeg is very normal and natural.

They are both in the present tense.

• drikker = drink / am drinking
• hviler = rest / am resting

In Danish, the present tense can often cover what English expresses as either:

• I drink / I rest for habits, or
• I am drinking / I am resting depending on context

So this sentence could describe:

• a habitual action: After the workout, I drink water and rest
• or something happening now/in a narrative context

Yes, absolutely.

That version is also correct:

• Jeg drikker vand og hviler mig efter træningen.

The difference is mostly focus:

• Efter træningen drikker jeg vand og hviler mig.
  Emphasizes after the workout
• Jeg drikker vand og hviler mig efter træningen.
  Starts more neutrally with I

Both are natural.

Very often, yes. In this sentence it works very directly:

• efter træningen = after the workout

But like English after, it can also be used in a few different ways depending on context. For example:

• efter skole = after school
• efter arbejdet = after work
• efter middagen = after dinner

So this use is very straightforward and is a good pattern to learn.

A rough guide is:

• træningen ≈ TREH-ning-en

But a few things matter:

• træ- has the Danish æ sound, somewhat like the vowel in English trap, but not exactly the same
• -ning is like ning in running, but with Danish pronunciation
• the g in -ing is not pronounced like a hard English g

A more Danish-like pronunciation is something close to:

• TREH-ning-en

If you are learning pronunciation, it helps to listen to native audio, because Danish vowels and soft consonants are hard to guess from spelling alone.