if you can't balance your body on your one leg then you might need sck to walk in your 7 dayss so let me help you to strengthen your knees and increase your stability by achieving your tree pose shift your body weight on your one leg fix your gaze at one certain point spread your fingers fill the body weight on the outer edge of the foot most importantly shift your pelvic on the one side put your foot right beside your knees and gradually once you find the balance then you can lift your heels as higher as you can to fill up this Gap and raise your both hands all the way up and this is how you will able to achieve your tree PS