Tapas in its literal sense means austerity and self-discipline. In the order of 8 limbs, Tapas is the 3rd part of the 2nd limb of yoga, called Niyama.
Third Niyama: Tapas = Fiery self discipline
YOGA: The Third Niyama: Tapas, which translates to heat or
YOGA: The Third Niyama: Tapas, which translates to heat or
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