pick a component of breath: inhale, exhale, or inhale-exhale
instead of counting, on each occurrence, think: yay!
variation: gradually increase the yay intensity (♬a little bit louder now)
variation: gradually decrease the yay intensity (♬ a little bit...softer now)
variation: the longer its been since you remembered to yay, yay that much more loudly
eventually, stop yaying
did you, even once, sync a breath component with "yay"?
any further consideration is beyond the technique