User device position indication for security and distributed race challenges

A server, comprising:

• a processor;
• a computer readable storage medium accessible to the processor and bearing instructions which when executed by the processor cause the processor to:
• receive a request for an exercise competition from a first consumer electronics (CE) device;
• send the request to a second CE device for acceptance of the request by the second CE device.

A method, comprising:

• receiving user input to a consumer electronics device (CE) to challenge at least one contact of the user of the CE device to an exercise;
• uploading the challenge to a server;
• receiving a signal from the server indicating the challenge is accepted;
• at a predetermined start time, uploading to the server position information from the position sensor;
• receiving from the server map information presenting a position of the mobile device and a position of the at least one contact's user device;
• and
• periodically during the exercise, receiving updates of the map information including updates of the position of the mobile device and the position of the at least one contact's user device.