OK so Yoga isn't real easy. That said there are sites like this one who show you ways you CAN do it if you really want to. The Sun Salutation is the most well know of the pose sets and this article shows you how to do it without having to get down on the floor. Important when you have issues that make getting back up difficult. It is not a secure site but I assure you it is safe. I like this article because she shows you what to do but she also has suggestions on how to modify it for beginners
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