This posture may not feel great on the knees in the beginning, but this is one of the best postures for general knee health and for healing knee issues. If you are limited by tightness or injury, this pose in particular does not come overnight. Depending on your flexibility, you may not even be able to get your hips on the floor. Be patient. It takes consistent practice and just going little by little with attention and body awareness. If you are very flexible, this pose should feel great, or you may not feel much sensation at all. Focus on lifting the chest.