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major chakras, Sushumna and Kundalini i.e.) Yoga
PANCHA KOSHA
An analogy once described by Swami Niranjan went like this. Imagine a human being like an onion consisting of five layers. The outer ring or sheath the physical body, the second ring inside the bio energy sheath, the third ring or body the mental body, the fourth ring the psychic body or sheath, and the last ring the innermost essence being the spiritual essence and experience.
Yoga views health as essential and an outcome of having found a balance between our total personality and the world around us. This fits the total health model definition described by WHO in my opinion.

YOGA MODEL OF HUMAN BEING PANCHA KOSHA
From the Deepest most subtle body or sheath to the gross and Superficial body, Yoga views the innermost essence of everyone as:
Spirit Body- Anandamaya Kosha (body of Bliss)
Psychic Body-Vigyanamaya Kosha (Unconscious mind)
Mental Body- Manomaya Kosha (Conscious mind)
Energy Body- Pranamaya Kosha ( Bio-Plasmic energy, life force)
Physical Body-Annamaya Kosha (Food dependant, gross body)

there is a free flow of Prana or Chi (Life force or Subtle energy) within the Nadis or Meridians, which permeate our bodies there, is health. A bit like the bodies ability to maintain a physiological and Psychological homeostatic balance.
Yoga uses techniques that help boost, harmonise and refine the flow of Prana or Chi, thereby helping to maintain or enhance health.
NADIS AND MERIDIANS
When there is an imbalance or blockage to the flow of consciousness or energy that moves within these channels, then illness and or disease can manifest and impact on our health.
As in western medicine health problems can be created in many ways including somatopsychically and psychosomatically.
COMPONENTS OF BASIC YOGA
Yoga Postures - Asanas: are postures that stimulate the flow of Prana/ Chi throughout the body , they can include forward bending postures, backward bending postures, sideways bending postures, twisting postures, inverted, balancing and meditational postures.
Breathing Techniques – Pranayama :A repertoire of breathing exercises to revitalise the physiological components of respiration (breathing). Techniques to help balance the nervous system and provide the doorway to productive meditation.