Many have the idea that yoga increases flexibility. While that is potentially true, some of us need greater stability and strength. Ideally we find a balance between both stability and flexibility so that we can be pain free in our meditation posture. 
One basic principal in meditation is that we are becoming what we attend to. If we are in pain, we become a pain. Finding balance between stability and flexibility lets us attend to our other desires in meditation like alignment with our Higher Self. 
What has been taking your attention in your practices lately? Can you find enough flexibility and stability to hold yourself in right relationship with your higher nature? Ki to Happiness refines practice daily for dynamic functional balance so to attend to Higher Self and its Guidance.