Flexing and bending at the knees and hips is important in all of advanced skiing. Your legs have a far greater range of tipping when you are flexed at the knees and hips. Compare your range and ease of tipping with your legs flexed to standing up tall. Standing up tall or extending the legs, especially a transition, will hinder your progress in skiing because it greatly limits your tipping ability. You can use a mirror to practice flexing correctly at the ankles, knees and hips. Bending the torso forward at the waist while keeping the legs straight is not a functional substitute. Reaching toward and touching the sides of the boots will encourage you to flex in transition and while tipping. However, if you are having trouble flexing that much, touching the boots might encourage the forward waist bend. In this case, simply touch the side of your knee. Once you have practiced tipping and flexing on the level, try it on the slant board. Flex or bend the legs when you tip to engage and see how high of an angle you can achieve. Change edges, tip the feet down the board and practice flexing and tipping again. Finally, roll the feet between uphill and downhill edges. Keep both legs flexed and transition. Use a mirror and make sure you do not extend your legs during the edge change.