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Geshe Kelsang Gyatso teaches a great new way to practice breath meditation in his book The New Meditation Handbook.
Follow the breath as you normally would, and add this...
When you breath in, you mentally say the mantra OM. ("ohmmmm")
When you hold the breath for a moment, you mentally say the mantra AH. ("ahhhhh")
When you breath out, you mentally say the mantra HUM. ("hooooom")
OM is the body of all Buddhas.
AH is the speech of all Buddhas.
HUM is the mind of all Buddhas.
Before practicing you may want to say aloud, "May I have the body, speech, and mind of a Buddha for the good of all."
Then, when you are practicing, have faith that you are being blessed with the body, speech, and mind of a Buddha.