I was so happy to find Yoga One after recently moving to Charlotte. The space is groovy and the teachers are excellent (and they have a cool store). However, the heated room is just too much for me. I understand the rationale behind the heat, but do not personally feel that it increases the yoga practice. In fact, I believe it can actually hinder it by becoming a distraction and also alowing one's muscles to stretch beyond their natural capability. Sadly, the heat is too much of a deterent for me to go back.
Pros: great space, great teachers
Cons: heat
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