Authentic yoga means controlling mind and senses to meditate on Krishna, not cheating people with physical exercises for profit.Listen — Srila Prabhupada Uvaca
Prabhupāda: …and the cheaters come and cheat them, [indistinct]. Here it is clearly stated, śucau deśe pratiṣṭhāpya sthiram āsanam ātmanaḥ nāty-ucchritaṁ nāti-nīcaṁ cailājina-kuśottaram tatraikāgraṁ manaḥ kṛtvā yata-cittendriya-kriyaḥ upaviśyāsane yuñjyād yogam ātma-viśuddhaye [Bg 6.11–12] [To practice yoga, one should go to a secluded place and should lay kuśa-grass on the ground and then cover it with a deerskin and a soft cloth. The seat should neither be too high nor too low and should be situated in a sacred place. The yogī should then sit on it very firmly and should practice yoga by controlling the mind and the senses, purifying the heart and fixing the mind on one point.] Supreme.
The heart and the soul. Yoga is meant for that. Samaṁ kāya-śiro-grīvaṁ [Bg 6.13]. [One should hold one's body, neck and head erect in a straight line and stare steadily at the tip of the nose. Thus with an unagitated, subdued mind, devoid of fear, completely free from sex life, one should meditate upon Me within the heart and make Me the ultimate goal of life.] That is come on, a straight line.
Samaṁ kāya-śiro-grīvaṁ, neck. Dhārayann acalaṁ sthiraḥ: stand still. Samprekṣya nāsikāgraṁ svaṁ diśaś cānavalokayan [Bg 6.13]: no, not even seeing any other thing. Praśāntātmā vigata-bhīr: and a happy attitude; without any fear.
Brahmacāri-vrate sthitaḥ: con…, fully celibacy, brahmacāri. Vrata: not by name brahmacāri—by vow. No sex life. Brahmacāri-vrate sthitaḥ.
Manaḥ saṁyamya mac-citto yukta āsīta mat-paraḥ [Bg 6.14]: [One should hold one's body, neck and head erect in a straight line and stare steadily at the tip of the nose. Thus with an unagitated, subdued mind, devoid of fear, completely free from sex life, one should meditate upon Me within the heart and make Me the ultimate goal of life.] “In this way one should be engaged in meditation, thinking always of Me,”mat-paraḥ. This is yoga. What is he has recommended? He can do whatever he likes.
And haṭha-yoga also, aṣṭāṅga-yoga, according to Kapila Muni, that is also yaṁa. Why? Immediately beginning, yaṁ, yaṁ, āsana, dhyāna, dhāraṇā, prāṇāyāma, pratyāhāra, eh? Then samādhi.
[indistinct]. This means this man is cheating everyone. This man is cheating; he does not know what is yoga. And because these Western rascals, they want to be cheated, they come and take money, and they think they are yogī.