A system designed for exercising while sitting includes a rigid housing configured to receive at least one sensor to detect motion. The sensor is configured to identify an oscillatory motion of a knee raising and lowering through pivoting of an ankle of a user wherein a heel of a foot of the user lifts off of a surface and wherein a toe of the user remains planted on the surface. A mobile device in wireless communication with the motion sensor runs an application that provides a user with a multitude of features. The features include exercise statistics, energy spent, and steps taken. A further feature of the mobile device application is to provide a user with a virtual environment on the screen of the mobile device. Exercise performed by the user is translated into forward motion in the provided virtual environment.