Ive been training for about a year now, and stretching fairly regularly. My hip flexibility hasn't improved much at all. I cant come close to doing the splits, and in butterfly my knees are about 8 inches off the ground. I do the s stretch and am seeing goo improvements there and I can bend straight over and put my palms flat on the floor. I have been trying to get my hip flexibility to where I can do high kicks, but the best I have been able to do is a high ribcage shot. Is it possible that my hips are layed out in such a way as to limit my range of motion in these areas? or do I just need to stretch more often?