I have seen the snorkel idea as there are a few MMA fighters that train that way. Sena or Cena sp had a video interview where his workout regiment included the mask and snorkel. You would look silly with just the snorkel LOL.
The principal behind the snorkel is oxygen deprivation what it does is limit the amount of O2 you get in your blood stream requiring your body to utilize a higher percentage of oxygen from the limited amount of air intake.
I've never seen any information that substantiates the benefits of this, have you? I think you're talking about Wanderlei Silva training with the mask, the last fight he had, this was mentioned but the announcers even said they thought it was bogus.
