An article of footwear includes an upper member and a sole structure, with a sensor system connected to the sole structure. The sensor system includes a plurality of sensors that are configured for detecting forces exerted by a user's foot on the sensor. Each sensor includes two electrodes that are in communication with a force sensitive resistive material. The electrodes and the force sensitive resistive material may have multi-lobed shapes. Additionally, the sensor system may be provided on an insert that may form a sole member of the article of footwear. The insert may have slits therethrough, and may have a defined peripheral shape.