I've been to Spain and it's a pretty ghetto country. It's like Italy with fatter and meaner people.
The bull meat also wouldn't taste tender at all since it's not castrated and constantly exercising.
That's why the Japs massage their cows--to get the meat relaxed and tender.
Actually they do that because the cows are kept in too little room to properly move around. The massaging helps their circulation, it doesn't directly make the meat more tender. Actually, they would probably get the tenderness from not having room to move around.