På motionscyklen kan jeg læse nyheder, men på løbebåndet mister jeg hurtigt fokus.

Because Danish often puts a place or setting first when that is the topic of the sentence.

So På motionscyklen means on the exercise bike, and it sets the scene before the rest of the clause:

• På motionscyklen kan jeg læse nyheder
• literally: On the exercise bike can I read news

This is very common in Danish. English can do it too, but Danish uses this kind of fronting even more naturally.

This is because of the V2 rule in Danish. In a main clause, the finite verb must come in the second position.

Here, the first position is already taken by På motionscyklen, so the verb kan has to come next:

• På motionscyklen = position 1
• kan = position 2
• jeg = comes after the verb

So:

• På motionscyklen kan jeg læse nyheder

If you started with Jeg, then you would say:

• Jeg kan læse nyheder på motionscyklen

Both are correct, but the emphasis is slightly different.

In Danish, på is commonly used for being on machines, surfaces, or equipment.

So:

• på motionscyklen = on the exercise bike
• på løbebåndet = on the treadmill

This matches English fairly well, since English also says on the treadmill and on the bike.

Those endings show the definite form in Danish.

• en motionscykel = an exercise bike

• motionscyklen = the exercise bike

• et løbebånd = a treadmill
• løbebåndet = the treadmill

Danish usually adds the definite article to the end of the noun, instead of putting a separate word like the in front.

The choice between -en and -et depends on the noun’s gender:

• motionscykel is a common gender noun → -en
• løbebånd is a neuter noun → -et

Because news in Danish is normally expressed with the plural noun nyheder.

• en nyhed = a piece of news / one news item
• nyheder = news

So læse nyheder means read the news or read news articles.

This is very natural Danish. Even though English uses news as a singular-looking mass noun, Danish usually uses the plural form nyheder.

Because læse nyheder usually means read news in general, not a specific set of news items.

Compare:

• læse nyheder = read news / read the news in general
• læse nyhederne = read the news, meaning a more specific or known set of news items

In this sentence, the indefinite plural sounds natural because it describes a general activity.

Because men is a coordinating conjunction meaning but. It joins two main clauses.

So the sentence is:

1. På motionscyklen kan jeg læse nyheder
2. men på løbebåndet mister jeg hurtigt fokus

After men, you simply start a new main clause. Since på løbebåndet is fronted in that second clause, the verb again comes second:

• på løbebåndet = first element
• mister = second position
• jeg = after the verb

So the V2 rule still applies.

It breaks down like this:

• mister = lose
• jeg = I
• hurtigt = quickly
• fokus = focus

So literally:

• lose I quickly focus

But because of Danish word order, that is the normal structure after a fronted phrase:

• På løbebåndet mister jeg hurtigt fokus

English would reorder it as:

• On the treadmill, I quickly lose focus

Because hurtigt is an adverb modifying the verb mister.

In Danish, adverbs like this often come after the subject and before the object or complement:

• jeg hurtigt mister fokus would not fit normal main-clause V2 order here
• mister jeg hurtigt fokus is natural

So hurtigt tells us how or how soon the losing of focus happens: quickly.

Because fokus is used as an abstract noun here, much like English focus in lose focus.

So:

• miste fokus = lose focus

This is a fixed and very natural expression in Danish. You do not normally need et or the definite form here.

You could also hear:

• miste koncentrationen = lose concentration

But miste fokus is perfectly normal.

It is a normal word in modern Danish, originally borrowed, but fully established in everyday use.

You will often see it in expressions like:

• have fokus = have focus
• miste fokus = lose focus
• holde fokus = keep focus

So even if it looks international, it behaves like an ordinary Danish noun in many contexts.

Because the sentence contains two coordinated main clauses joined by men.

The two clauses are:

• På motionscyklen kan jeg læse nyheder
• på løbebåndet mister jeg hurtigt fokus

In standard Danish writing, a comma before men is normal here, just as in English you would usually write a comma before but when joining two full clauses.

Yes. A very natural alternative would be:

• Jeg kan læse nyheder på motionscyklen, men jeg mister hurtigt fokus på løbebåndet.

This version is also correct. The difference is mostly one of focus and style:

• På motionscyklen ... / på løbebåndet ... emphasizes the contrast between the two machines
• Jeg ... men jeg ... emphasizes the speaker a little more

The original sentence is especially good because it highlights the contrast very clearly.