Also, in yoga class, the teacher played this helpful audio tape that musically assists you in counting meditative breaths. Inhale six, hold three, exhale twelve is a good pace.
Says the website:
“Consistent, even measures allow the body itself to count by following the sounds creating an even, more effective practice, free from mind activity, and deeper relaxation. We have found that the body learns and connects to the patterns in a short time. By changing the breathing pattern habitual underbreathing, so familiar in our stressed society can be broken.”