Illusions Trails is an App filled with interactive environments that you can move through as you walk in place in front of your TV. You can also walk on a treadmill, stair stepper or elliptical. Regardless of how you like to keep fit and add steps, Illusion Trails will help keep you motivated. Your phone senses your movement and displays your virtual-world movement down the trails. You tap the screen of your phone to select the paths and hidden trails that you want to explore.