Learn Spanish (Spain): Los domingos hacemos senderismo en la montaña. - On Sundays we go hiking in the mountains.

In Spanish, you don't use a preposition like "on" with days of the week. You just use the definite article. El domingo means "on Sunday", and making it plural, los domingos, means "on Sundays" or "every Sunday".

Why do we use hacemos (we do) instead of a verb for "we go"?

While English says "to go hiking", Spanish treats it as an activity you do. The verb hacer (to do or to make) is paired with many sports and hobbies. So, hacer senderismo translates literally to "to do hiking".

English says "in the mountains" (plural), so why is en la montaña singular here?

In Spanish, la montaña is often used in the singular to refer to the natural environment as a whole. It is similar to how we say "in the countryside" or "at the beach" in English. You can say las montañas, but the singular form is very natural and common for this phrase.

Does the word senderismo come from another Spanish word?

Yes! It comes from sendero, which means a "path" or "trail". Adding the suffix -ismo turns it into the name of the activity, so it literally means the practice of walking trails.