Our great ancestors like Janak, Kabir, Raidas etc. and many others in recent times who were in the hot pursuit of Self-Awareness [Mumukshajanas] performed work without attachment and we must follow suit.
Those who always remain detached, transcend karma automatically [are beyond karma and akarma]. Detached work [karma] is devoid of ego [sense of doing]. It is this detached work which has been termed as KA...RMATYAGA [being free from work or shedding the work]. Performing the detached work is called VIKARMA.[4:14-19]
No sin can be imposed upon the practitioners of this kriya. It is only on attaining Kaivalya that one becomes NISHKAMA [free from desires] and is adored with the divine qualities of SARVAPARIGRAHA and PURNA CHAITANYATA.
It is this KRIYA which has been explained as SAHAJA-KARMA in the 48th shloka of the eighteenth chapter [4:20-23]
The phenomenon of merger [AHUTI] of five pranas [APANA, UDANA , SAMANA, VYANA and PRANA] with the main prana [MUKHYA PRANA] is called the great deed or karma [MAHAKARMA].
A sadhaka himself becomes BRAHMA when he learns this KARMA from the Rev. Sadaguru and keeps on performing it. [4:24]"
-- Lahiri Mahasay, Bhagavad Gita Commentary