I have been teaching techniques for better breathing which really work for over fifteen years.  I don't teach my students to hold their breath because that simply does not work for singing, but you also don't need to be a singer or even interested in singing in order to learn to breathe consciously, more efficiently, for a better life experience.  If you or a friend would like to learn to relax without having to learn to hold your breath any more than you already do, either call me or email me.  I am in the Cleveland area and can meet with you.  I can also meet with interested parties further away through SKYPE if they have that service.   I may be a more practical choice for you than having to take a Yoga class.