Sit Properly: Yoga sastras proclaim that sitting straight facilitates concentration: “Right posture makes the mind calm” Tantra-raja-tantra 27.59
Chant Without Interruption: Once in Los Angeles, disciples asked Srila Prabhupada what would please him most. “Chant sixteen rounds of japa at one sitting without interruption!” said Srila Prabhupada.
Be Careful: To clearly and distinctly pronounce the Holy names.
From Art Of Chanting Hare Krsna
by Mahanidhi Swami