One should always think positive while practicing this Pranayam and think that all the disease and dosha(impurities/ailments) present in the body are going away and the body is being filled with fresh, new and positive energy. This type of auspicious and positive attitude gives better results.
This is totally harmless Pranayam. It controls the playfulness of the mind, increase the digestive fire, it is beneficial in stomach related disease. It makes the mind sharp and intelligent. It purifies the body, cures early ejaculation and humors related problems. Bahya Pranayama strengthens the stomach organs and in the beginning the practitioner might feel pain in weak part of the stomach. There fore take plenty of brakes in the beginning and practice all three locks while practicing this Pranayama.