Breath is the primary and most accessible point of focus in Mindfulness meditation and it comes from the Buddhist tradition. By training our minds to focus in the here and now, we become more aware of our actions, feelings, thoughts and perceptions. By being more aware and learning why we do what we do (our habits) more chances we have to be able to make positive changes in our life styles.
This type is the most well researched type of meditation in our Western Medical community and it is the most common type practiced, even Wall Street has falling in love with this type of meditation. From Fortune 500 CEOs to Monks in the Himalayas, this is probably the most practiced type of meditation.