Learn Italian: Noi verremo in palestra ogni mattina. - We will come to the gym every morning.

The verb venire (to come) is irregular in the future tense. Instead of just dropping the final -e from the infinitive (which would incorrectly make "veniremo"), it changes its stem completely to verr- with a double -r-. Then, you add the standard noi future ending -emo to get verremo.

Why do we use the preposition in for "to the gym" instead of a or alla?

In Italian, certain common locations take the preposition in without any article when you are going to or are inside them. Palestra (gym) is one of these words. It works just like in banca (to the bank) or in farmacia (to the pharmacy). These are set phrases that are best to just memorize!

Could I say tutte le mattine instead of ogni mattina?

Yes, absolutely! Ogni mattina translates to "every morning," while tutte le mattine means "all the mornings." They mean the exact same thing in this context. Just remember the grammar rule: ogni is always followed by a singular noun without an article, while tutte requires the plural article and plural noun (le mattine).

Is the word Noi required at the beginning of the sentence?