What is health, What is fitness
According to WHO (World Health Organization), Health is nothing but a complete state of physical, mental, social and spiritual welbeing and not merely the absence of any disease or deformity.
This definition resembles with the holy version of Maharshi Sushruta (considered to be the father of surgery)
where he says-
Sama dosha samagnischa sama dhatu mala kriyah.
Prasannaatmendriya manah swastha iti abhidhiyate..
(Su Su 15/41)
A state of balanced dosha, agni(power of appetite and digestion), dhatu(tissue), mala(excreta) and pleasant mind, sense organs and soul is called Health. In this definition social health is not described. But it is not overlooked. It is described in Janapada Dhwnsa in Vimana Sthana of Charak Samhita.
To keep the fitness, to conserve the good health lots of things have been advised by the health Gurus. Some of them are Dina charya (daily routine), Ritu charya (seasonal routine), Sadvritta (dos and donts), Achara Rasayana (behaviour) and guide lines for traya upastambha (three sub pillar of life) that is food, sleep and sex.