Questions & Answers about Aquesta rutina és fàcil.
Because rutina is a feminine singular noun, and Catalan demonstratives have to agree with the noun they go with.
- aquest = masculine singular
- aquesta = feminine singular
- aquests = masculine plural
- aquestes = feminine plural
So:
- aquest llibre = this book
- aquesta rutina = this routine
In Catalan, many nouns ending in -a are feminine, and rutina is one of them. That is why it takes feminine words around it, like aquesta.
You can see the agreement clearly:
- aquesta rutina
- not aquest rutina
As with all nouns, it is best to learn the gender together with the word.