This app uses computer vision and machine learning to identify users foot movement. Since we use AI method to identify users activity, we cannot guarantee 100% percent accurate to recognize user activity at this moment and we are still improving the performance.To use the app:(1) download the App, and hold your cellphone with stick or holder (about 0.5 meters high)(2) open the app, and touch to start(3) stand about 1-2 meters away from the cellphone, so that your whole body can show up in the screen.(4) stand still and then wait 3/2/1 seconds (showed with red color in the cellphone screen)(5) move your foot to play with Jianzi in the screenThere are 3 rounds for each game, so you do not need to touch your screen until you finish 3 rounds.Additionally, if you have smart TV screen, you can cast it to big screen for better experience.