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Pain when kneeling is very common and is often eased with some added cushioning. This design has a concave center for stability and can be placed anywhere on the mat.
I like these better than the ones that strap to your legs because they don't add unnecessary bulk.
Try them also as extra padding under feet, hands or elbows.
If you suffer from joint pain during exercise these may bring some relief. They are reasonably priced and might make some asanas more comfortable.
Sold in sets of 2.