Yoga can help improve your posture, which will make you feel and look taller, but it will not make you "grow" any extra inches.
The bones in the body stop growing once you reach adulthood, and thus make it impossible for the body to increase it's height.
Practice the mountain posture (tadasana) not only in your yoga practice, but all through your day, standing, sitting, driving your car, waiting in line at the supermarket. Consciously keep your awareness on your posture, keeping the spine long and straight as much as possible.
Ahimsa, the yogic practice of non violence must be adhered to when engaging in the practice of hatha yoga. Respect your body's limitations and inner wisdom, if something feels wrong or dangerous, please do not do it.
Please consult your health care practitioner before starting a yoga, pranayama or other exercise program.
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