path is cultivation of monistic philosophy. And for the rest of the jivas, pure devotional service is most suitable.

What is karma?

"Persons absorbed in material life begin to worship the Supreme Lord out of fear of : The Lord's lotus feet are the perfect shelter, free from anxiety. They are the only means to cross over the unlimited, ocean of nescience. But when the process to obtain the protection of the Lord becomes colored by material motives, it becomes mundane; Even though the Lord is being worshipped, because the process of worship is mundane, it is known as pious activity or subhakarma. Subhakarma includes: altruistic work, sacrifices, ablutions and holy baths, fire sacrifices, charity, yoga, the practice of varnasrama-dharma, pilgrimages, vows, offerings to the forefathers, meditation, cultivation of empirical knowledge, propitiation of demigods, penances, austerities, etc. All these activities are on the mundane platform.

Contrary to popular belief, hatha yoga exercises are not designed to make fat people thin or to make the body immortal, but to help unblock the gross and subtle nervous systems so that the "life air" can flow freely through the body (specifically, from the base of the spine to the top of the head).
Science of Identity Foundation | Jagad Guru Speaks

Gradually, through this mundane process, the performer obtains the goal of all his performances: the Supreme Lord. At this juncture, he abandons the temporary mundane process. He is not attracted any more to its material ways, for he now knows the genuine essence of all religious duties. He has found devotional. service to the Lord, bhakti.

The process of pious activities or subhakarma

"The jiva's contact with matter gives rise to his discontent and suffering, This is all by the master plan of Providence, which gradually guides the jiva to perfection. The conditioned souls cannot exist without close contact with matter. All their activities and thoughts are intimately woven into the fabric of materialism. Pious activities (subhakarma) provide the means for the jiva to approach pure devotion through material contact. Therefore, subhakarma is indeed a viable path for any conditioned soul to approach the ultimate goal, love of Godhead. Yet one fact must be clearly stated: reaching perfection through subhakarma is a time-consuming affair. The ultimate object is krsna-prema,