Ek OnKaar Sat Naam

Yoga is an excellent way of keeping fit, mobile and alert. Health improvement aspects are all well known and are now widely recognised in the western world, especially since mid 1960s

Yoga also developed as more than just a way to improve health and control the mind.

It had been recognised and developed many centuries before Patanjali. However the object then was spiritual. The limbs discussed by Patanjali, in Astanga (Eight-limbed) Yoga or Hatha Yoga are discussed in the Bhagavad_Gita (a Vedic scripture). The same system was later known as Raja Yoga, and is referred to as such in Sri Guru Granth Sahib Ji, but Guru ji indicates that the essence of Raja Yoga (ie the spiritual benefits)can be directly attained through Naam Simran and Naam Jap, without going through lower steps like pranayamas or asanas.
Reference:: Sikh Philosophy Network http://www.sikhphilosophy.net/health-and-nutrition/26361-health-benefits-of-yoga.html
Reference:: Sikh Philosophy Network http://www.sikhphilosophy.net/showthread.php?t=26361

It requires single-pointed concentration, or fixation, upon an object - the object being Satguru, with respect to Sikhi. This leads into meditiation, and finally complete absorption into, or oneness with, Satguru. This phase is dealt with in the upper three limbs ( dharana, dhyana, and samadhi).

Sat Sri Akal