Tina, I'm not yet bone on bone, but I am doing physical therapy and 2 of my exercises are narrow stance squats on a balance cushion (I don't have a bosu like the rehab center) and bulgarian split squats. Anyway, the slight bend in the knees while sliding is not as deep as a squat.
Before you invest in a slide, you might consider gliding discs. I don't think they're as good for cardio, but the movement is similar. Some people use furniture movers, like bed bath & beyond has. An excellent DVD to introduce the movement is Gliding for the Active Older Adult, available at amazon and ebay. The gliders they use aren't my favorite, I prefer Valslides. You can use paper plates also.
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"It takes work to change the shape of this muscle." Susan Harris in The Firm Vol. 1, talking about the triceps, in 1986
Still working on my triceps after all these years.
~Cynthia
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