Sitting meditation isn’t easy. And I’m not just talking about the ever-wandering mind. The actual act of sitting is an art and science in its own right. It sounds odd to say this, but sitting is actually pretty rigorous. That’s because virtually all meditation traditions advise meditators to sit upright with a straight spine and no back support. The theory is that a straight, unsupported spine will keep you more alert and energized. The traditional sitting position is usually...

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