If the chit-chat forum discussion format is an easier way for you to understand things much more clearly then perhaps you might find the thread Ergonomics: Consider or Ignore? to be more beneficial for you? Hope that helps, although, as others have said, you'll find plenty of help, advice, and resources on computer ergonomics from just Googling.
As for the question in the topic title - It the risk of blogging be a danger to your health would be dependant on a number of simple and complex factors. But it's highly unlikely that blogging (even full-time) is going to be a danger to your health. At the same time, I'm not a qualified doctor!