I believe that it was a mexican short movie. It starts off with a man in a physiatrist’s office who recommends he goes on vacation. He begins to take a mud bath on the beach while listening to music when zombie things come out of the water and kill almost everyone on the beach. He then sees the zombies and kills all of them. The film is incredibly gory, there is excessive blood, spine ripping, etc. Thanks in advance.
“Brutal Relax(2010 Short Film)
You can watch it here: https://www.youtube.com/watch?v=f-6znWUbWWw