Learn Swedish: Du kommer aldrig att glömma det här träningspasset. - You will never forget this workout session.

In a standard Swedish main clause, sentence adverbs like aldrig (never) or inte (not) come right after the first conjugated verb. Here, that is the helping verb kommer. The rest of the verb phrase, att glömma, has to wait until after the adverb.

Why does träningspasset have the definite -et ending when we already used det här (this)?

This is a classic Swedish rule often called the double definite. When you use demonstratives like den här or det här (this), the noun that follows must also be in its definite form. Since ett pass is an ett-word, we use det här and add the definite suffix -et to the noun.

Could I drop the att and just say kommer aldrig glömma?

Yes, in everyday spoken Swedish, the att in the future tense construction kommer att is frequently dropped. However, keeping att is the standard and formally correct way to write it, which is why you see it here.

How is the compound word träningspasset formed?