In the Hatha Yoga Pradipika
Yuva vridhova vyaadhito durvloipi va
Abhyasaat Siddhimapnoti sarvayogeshvatandrit (H. P.)
The door of yoga is open for everyone, whether he is young, old, sick or weak, everyone can do the practice of yoga sadhana.
once he has let go of laziness Siddhis can also be gained❗
Shri Dattatreya Maharaj says:
Brahmin: Shramano vapi Boudho vapyahritosthva
Kapihko va charvak: shradhya sahit: sudhi:
Yogabhyasarto nityam sarvasiddhimvapnuyaat
The practitioner of yoga can be:
✅Believer of the Vaidik faith
✅Non-believer or Atheist (one who does not believe in God);
If he remains in the regular, consistent practice of yoga with understanding and faith, he will surely gain the divine powers (siddhis).
TO GAIN SUCCESS IN YOGA, one neither needs any special clothes or outfits, nor any special mantra, nor does he need to believe in any special God or Saint. What he needs to believe in the promise of shastras (texts) or the guru, just like we believe in the doctor to get well.
There is no restriction of faith to do yoga, nor restriction of age, nor restriction of sex. You can be a follower of any faith, you can be a Hindu, Muslim, Christian, Jain, Buddhist or Sikh or be from any country…