A system incentivizes people to engage in physical activity. A persons physical activity may be monitored over a period of time. Such monitoring may occur by using a sensing device carried or worn by the user. In the system, one or more thresholds for physical activity are established. Information tracked using the sensing device can be compared to the thresholds. A percentage of physical activity relative to the threshold can be translated to a reward established for the physical activity, and the percentage may be used to determine a reward value for an electronic device relative to a full available value. Rewards may include times or amounts. Time values may indicate durations during which particular activities or devices may be used. Amount values may indicate an amount of a battery charge, a number of communications, a currency value, or other values relative to use of an electronic device.
