Translation of deltoides

I will usually use the most usual sense of the term, and not the more sophisticated ones and I think you will understand what I wanted to say. In any case we should review all words every two days or so.
Now I'm drinking a beer with a colleague. We will shoot a film about the bar scene and the situation of young people here in Ibiza. There are also other aspects to live here, besides tourism.
I'm helping you with Spanish and you can help me with English. How did you teach yourself the grammar? Here in Zurich it has being raining for 5 days and we have spent most of the time in front of the TV.