Footwear having sensor system

An insert configured for use in an article of footwear, comprising:

• an insert member adapted to be placed in contact with a sole structure of the article of footwear, the insert member being formed of a flexible polymer material and having an opening;
• a plurality of force sensors connected to the insert member, the force sensors being adapted to sense a force exerted on the insert member;
• a plurality of sensor leads extending away from the force sensors;
• and
• a port comprising:
• a housing connected to the insert member, the housing comprising a chamber accessible through the opening in the insert member and adapted to removably receive an electronic module therein by insertion through the opening;
• a plug extending into the chamber from a wall of the housing, the plug configured to be received in a receiver within the electronic module when the electronic module is received in the housing;
• and
• an interface in communication with the sensor leads and having a plurality of electrical contacts located on the plug, wherein the interface is configured to form an electrical connection with the electronic module, and each of the sensor leads is individually connected to one of the electrical contacts of the interface, such that the electronic module engages the electrical contacts to place the electronic module in communication with the sensor leads and the force sensors individually when the electronic module is received within the chamber and the plug is received within the receiver of the electronic module.