I've recently taken up yoga for a back problem. The breathing took some getting used, a long inhale through the nose filling up your chest, diaphram and stomach (push that belly out) followed by a long exhale emptying everything (pull that belly in), again through the nose. I do this now on a regular basis even when not practising yoga, 5 breaths only, and have found two spin-offs; my singing range is widening and becoming firmer at the edges and also my blood pressure is down and I'm more relaxed when singing.

oggie

BTW - my back is also a lot better!