I think it's important to note that yoga-- like everything else in life-- is not a static, unchanging system. The yoga that's exploded in popularity in the West over the past few decades is actively evolving. It's not the same discipline that was passed down from guru to disciple in the temples of India thousands of years ago, although that's not to say that what is taught today is any less spiritual or valuable. It seems to me that Mohler's commentary draws from his interpretation of a discipline quite different from what many yoga practiioners in practice studios, fitness centers, and spas today.
My experience has been that my yoga practice is what I make it. If I come to my mat with an intention of growing spiritually, psychologically, and in my relationship to the world I life in, it's going to be a very different 90 minutes than if my intention is to burn a few hundred calories.
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