You can chant the OM after your physical and energetic practices. Then, meditate in stillness and silence. The ideal asana for the OM mantra is the siddhasana for males and siddha yoni asana for females. Siddhasana directly stimulates the spinal cord, making the technique more potent and confined. Alternative to siddhasana is sukhasana (happy posture) and ardha padmasana (half lotus).
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Our nervous system has a special relationship with the sacred fire and by meditating upon the constant light within and around us, we can powerfully dissolve the senses into the cosmic infinity and eternity.
Breath is life. Meditating upon its presence is meditating upon our lives. It is the now, the present as it is. We can apply the skill in almost all the things we do daily. As soon as we bring our attention to the breath, the great power of observation comes to us naturally.