what does it mean to be healthy...

What does it mean to be healthy?

It's when all the faculties of the body function harmoniously under the intelligent control of the mind.
(State of health does not only refer to the physical body but also the more subtle portions of our being. Means the mind is manipulated by prana and prana is manipulated by our will power. (definition between Hatha yoga and Raja yoga). Real health means when it spills out to every pore of our being, there are 3 stages. Health is a state that embodies Satva.

When we are healthy we have an abundant, almost inexhaustible amount of energy to carry out any type of work.
When we are unhealthy we feel ourselves depleted of any inspiration and or energy to accomplish any task.

Where is the energy/supply come from? This supply comes from within us/prana
Since will power is more subtle than prana, to consciously regulate the flow of prana, to bring about a state of mental equilibrium where the innate divinity is clearly reflected by the intellect. This is called Raja Yoga.

Hatha Yoga means utilizing the grosser portions of our being IE: body and breath, to regulate the flow of prana.

The physical and mental bodies are animated and replenished with prana

What is prana?
is verily the life of all beings therefore it is called the universal life energy. Prana is force on every plane of being, form the most gross to the most subtle.

Prana is found in food, water, air, sun taste(all senses)
However it is something separate from them, so the prana is the subtle portion animating potency that gives all these things life. (the different things being.....food, air etc....) which helps/supplies us with prana

So the storage center of this prana is the solar plexus
-grossest manifestation of prana is the lungs
-subtle manifestation is the thought

The aim of Yoga is to control one's mind!

So then how does the yogi use this pranic energy force to bring about the desired state.

The ocean has waves like the mind has thoughts. The waves in the ocean are generated by the movement of the wind, likewise the thoughts are generated in the mind by the flow of prana.
When the wind moves moves in one direction over the surface of the water the waves become rough, unmanageable. When that same wind changes it's direction blowing over the surface of the water, it becomes placid, wave less. Likewise our minds are subject to the same phenomenon, so if the prana is in an agitated state our mind/body an overall health will reflect this agitation. BUT through the practice of pranayama one learns to control the subtle prana, making it flow more smoothly throughout the nervous system. This harmonious flow of prana that is gain through the practice of pranayama reflects thus in the body as abundant energy and in
the mind as restfulness, contentment and concentration