Ashtanga vinyasa yoga has an obvious, linear progression. As you master a posture, you add another posture. The difficulty of postures steadily increases, as does the challenge to your endurance. Adding postures, making the practice longer and smoother, being able to accomplish more and more difficult postures: these are all signs of progress. But sometimes you get stuck, for one reason or another. For example, personally I had a period of about six months of working to achieve basic competence in Kapotasana (catching the heels) when I didn't add anything else-stuck. I'm also...
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