In the Bhagavad-gītā it is clearly said, anāśritaḥ karma-phalaṁ kāryaṁ karma karoti yaḥ, sa sannyāsī . . . sa sannyāsī sa yogi ca na cānya akriya (BG 6.1). The meaning of this verse is that anāśritaḥ karma-phalaṁ. Everyone is working in this material world for some salary or for some remuneration, but if one works not for salary or for remuneration but as a matter of duty . . . anāśritaḥ karma-phalaṁ kāryam. Kāryam means "It must be done." Karma karoti yaḥ: "In such a way if somebody acts, then sa sannyāsī, he is sannyāsī."
Just try to understand. Anāśritaḥ karma-phalaṁ. You are doing some work. Why you are doing some work? Either for some salary or for some profit or for some gain. Otherwise nobody is working uselessly. He must have some gain. But one who does not utilize that gain for his sense gratification but works as a matter of duty, kāryaṁ karma karoti—sa sannyāsī sa yogi ca, such person is actually a sannyāsī and yogī
You have heard the name of yogī. Yogī means that he has no other business. The sannyāsī and yogī is the same, because yogī has no other business. He is simply trying to concentrate his mind on the Viṣṇu. Dhyānāvasthita-tad-gatena manasā paśyanti yaṁ yoginaḥ (SB 12.13.1). Yoginaḥ. Not these black yogīs; the real yogī. Real yogī means he is always in meditation, dhyānāvasthita. Dhyāna means meditation. Dhyānāvasthita manasā. Where meditation is performed? In the mind. That means concentrating the mind. Dhyānāvasthita manasā.
Then what is that concentration? Dhyānāvasthita-tad-gatena manasā paśyanti yaṁ yoginaḥ (SB 12.13.1). Yam, whom. That means the Supreme Viṣṇu. One who sees the Supreme Viṣṇu always within his mind by concentration, he is called yogī. Yogī does not mean to show some magical or gymnastic feats. These are . . . this practice of āsana or breathing exercise, that will help you for concentrating, pratyāhāra. There is a term, pratyāhāra. Pratyāhāra means you draw your engagement of the senses from matter, and you engage them in the Viṣṇu. That is yogī.