It's not rating a minimum power or a recommended power. Most 100-watt car speakers will work perfectly well on factory radio outputs, and you aren't going to do them any harm by trying them out. (Ignore anyone who tells you that you can blow any speaker by using it with too low power an amplifier; this is not true).
Ujjayi breath. Ujjayi breathing is a breathing technique employed in a variety of Taoist and Yoga practices. In relation to Yoga, it is sometimes called the ocean breath. Unlike some other forms of pranayama, the ujjayi breath is typically done in association with asana practice.
This breath can be used in so many ways as a tool to do other things with the body and the mind. You will see with the Isha Kriya, we are using a simple process of breath, but the kriya itself is not in the breath. The breath is just a tool. The breath is an induction, but what happens is not about the breath.