"Karmayoga does not mean ceaseless pursuit of karma. It truly consists in the Yoga orientation and discipline given to the buddhi and the mind. Constant preservation and application of Yogabuddhi while doing any work, alone makes one a Karmayogin."
The Guiding force of Narayanashrama Tapovanam & Center for Inner Resources Development
a sādhaka (Sanskrit: साधक) is someone who follows a particular sādhanā, or a way of life designed to realize the goal of one's ultimate ideal, whether it is merging with brahman or realization of one's personal deity.