Hello, I'd like to make sure that the word "training" is uncountable and that it is always used in the form of "training (without "s") or "a training". 1. Training can be done in various ways. 2. A training can be done in varoius ways. 3. Trainings can be done in various ways. I think 1 and 2 are correct, and 3 is incorrect. Am I right? If 3 is a mistake, is there any chance that a native speaker of English make such a mistake? (Actually, it is described in a document from Australia.) Replies from native speakers would be appreciated.