Product Reviews Equipment Review: Bas Rutten’s O2 TrainerJuly 30, 20130Comments Here’s my review of the BEST breathing trainer around. Share this!TwitterFacebookGooglePinterestStumbleUpon bas ruttten cardio conditioning o2 trainer Jersey Beast Leave a Comment! Leave a Reply Cancel Reply Your email address will not be published. Notify me of follow-up comments by email. Notify me of new posts by email.