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These colorful symbols represent the life force centers of the body. Having all of them "open" allows energy to flow freely through mind, body and spirit which in turn helps to keep us balanced, healthy and happy.
The mat below is from Gaiam and is a good all purpose design suitable for all levels of experience. It is 6mm thick, durable, lightweight and has a non-slip surface texture. I use a similar one from the same brand and find it excellent for my home practice.
I've also found some matching pants and fitness tops, all featuring their own version of this popular design. I especially love the first pair of leggings which ooze confidence and positivity. They are bold and bright and will definitely make you stand out from the crowd.