How To Breath Counting On A Piano
Try to regulate your breathing as though it was rhythmically in time with something like a metronome. This type of breathing has quite a calming effect as you count each breath mentally (as you breathe in count 1, as you breathe out count 2, etc,). Try to continue counting keeping nice, steady rhythm, and concentrate on numbers. Also, note that these exercises should be done by breathing through your mouth with the lips slightly apart. However, breathing through your mouth alone is not very effective.
This and many other pianists advise were written by pro piano tutor Marina Petrov. You can have piano lessons in London with Marina by going to her personal website at www.MyPianoLessons.co.uk.