Hatha Yoga Pradipika – Who can practice Yoga?
Yuvo vrddhoativrddho va vyadhito durbaloapi va /
Abhyasat siddhim apnoti sarvayogheshvatandritah//(Chapter -1, Verse -64).
Either, Young or old, very old, sick or feeble, one can attain perfection in all the Yogas by regular constant practicing. (Chapter -1, Verse – 64).