The second practice is sound.
The books teach that the body has centers along its length, like small wheels of energy. The traditions of the East call them chakras. Each center answers to a particular vowel. When you sing the vowel slowly, its center vibrates, and the energy you have kept begins to move through it.
There are five:
I, said as ee
It sounds between the eyebrows. The books link it to inner sight.
E, said as eh
It sounds in the throat. It is linked to inner hearing.
O, said as oh
It sounds in the heart. It is linked to intuition.
U, said as oo
It sounds above the navel. It is linked to sensing what others feel.
A, said as ah
It sounds in the chest and the lungs. It is linked to remembering past lives.
You do not need to believe any of this to begin. Sing the vowels and notice what you feel. Most people feel the vibration settle in a different place with each sound. That much you can check for yourself tonight.
The tradition says an hour of the vowels a day is worth more than many books. Ten minutes is a good start. Sing them after the breath of page 38, when the energy is already moving.