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.
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The Power and Purpose of Tapas in Yoga • Yoga Basics
Understanding Tapas: The Third Niyama - Meaning and Practice
Yoga Niyama 3: Tapas- Self Discipline (part 1)- LauraGyoga
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Understanding Tapas: The Third Niyama - Meaning and Practice
Tapas In Yoga: 4 Ways This Niyama Will Light Up Your Life – Brett
10 Sanskrit Mantras in Yoga and Their Meaning You Should Know
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Tapas In Yoga: 4 Ways This Niyama Will Light Up Your Life – Brett
Tapas Meaning: Understanding the Third Niyama of Discipline - YOGA