02 trainer by Bas Rutten

I believe it is a great tool to develop human respiratory function ; it is especially suitable for combat sports because it is easy to use and it efficiently improve performance. I can really experience the difference and the development in my breathing capacity.02 trainer is well made and well packaged; it is definitively a good buy!

http://www.youtube.com/watch?feature=player_embedded&v=zjpKX--riCY