Data-capable strapband

A wearable device, comprising:

• one or more sensors configured to capture data associated with at least one attribute of an activity;
• a communications facility configured to communicate the data associated with at least one attribute of the activity to a server, the communications facility further configured to receive a value from the server, the value being determined by calculating the difference between the data associated with at least one attribute of the activity and another set of data associated with at least one attribute of the activity;
• a memory configured to store the data associated with at least one attribute of the activity and the value;
• and
• a notifications facility configured to send an activity update to the user, the activity update being a function of the value received from the server.

A method, comprising:

• receiving data associated with at least one attribute of an activity originating from each wearable device of a group of at least two wearable devices,
• aggregating the data associated with at least one attribute of the activity originating from each wearable device from the group of at least two wearable devices to determine an aggregated data set associated with at least one attribute of the activity;
• receiving data associated with the activity originating from each wearable device of another group of at least two wearable devices,
• aggregating the data associated with at least one attribute of the activity originating from each wearable device from the other group of at least two wearable devices to determine another aggregated data set associated with at least one attribute of the activity;
• calculating a difference between the aggregated data set and the other aggregated data set and determining a value associated with the difference;
• and
• communicating the value associated with the difference to each of the wearable devices of the group and the other group.