Fitness activity monitoring systems and methods

1. A method of tracking a pre-identified participant engaged in a fitness activity who is pre-identified by a spectator, comprising:

determining a location of the pre-identified participant during the fitness activity based on data received at a portable fitness device used by the pre-identified participant;

determining a location of the spectator during the fitness activity based on data received at a mobile spectator device used by the spectator;

determining whether the spectator is registered to track the pre-identified participant; and

if the spectator is registered to track the pre-identified participant, sending a first alert to the spectator at the spectator device during the fitness activity based on the spectator location and the pre-identified participant location, wherein the first alert indicates that the pre-identified participant is within a first predetermined distance of the spectator,

wherein at least one of determining the location of the pre-identified participant,

determining the location of the spectator, determining whether the spectator is registered to track the pre-identified participant, and sending the first alert is performed using at least one processor.

2. The method of claim 1 , further comprising at a server, receiving pre-identified participant location information.

3. The method of claim 1 , wherein the fitness activity includes a predetermined route.

4. The method of claim 1 , wherein the fitness activity is a competitive event including a plurality of participants.

5. The method of claim 3 , wherein the fitness activity is a marathon.

6. The method of claim 1 , wherein the fitness activity is a fitness activity scheduled by the pre-identified participant.

7. The method of claim 1 , wherein the fitness activity includes a route created by the pre-identified participant.

8. The method of claim 1 , wherein the first alert is a visual alert.

9. The method of claim 1 , wherein the first alert is an audible alert.

10. The method of claim 1 , wherein the first alert is a tactile alert.

11. The method of claim 1 , wherein the first alert indicates the distance from the spectator to the pre-identified participant.

12. The method of claim 1 , wherein the first alert indicates an estimated time of arrival of the pre-identified participant at the spectator location.

13. The method of claim 1 , wherein the data received at the portable fitness device and the data received at the mobile spectator device comprises at least one of global positioning system data and acceleration data.

14. The method of claim 1 , comprising:

receiving registration information from the spectator, wherein the registration information comprises spectator identification information,

wherein determining that the spectator is registered to track the pre-identified participant comprises determining that the spectator is a member of the pre-identified participant's social network, the social network being accessible via the Internet.

15. The method of claim 1 , wherein the pre-identified participant is a particular user identified prior to the fitness activity.

16. The method of claim 1 , wherein the pre-identified participant is identified by name.

17. The method of claim 1 , wherein the pre-identified participant is identified by bib number.

18. The method of claim 1 , further comprising pre-identifying the participant based on identification by a first user of a particular second user to track, wherein the particular second user is the participant engaged in the fitness activity.

19. The method of claim 1 , comprising:

if the spectator is registered to track the pre-identified participant, sending a second alert to the portable fitness device during the fitness activity based on the spectator location and the pre-identified participant location, wherein the second alert indicates that the spectator is within a second predetermined distance of the pre-identified participant.

20. The method of claim 19 , wherein the second alert indicates the spectator location.

21. A method of tracking a participant who is pre-identified by a spectator using a portable fitness device

during a fitness activity, comprising:

prior to the fitness activity sending an invitation to the spectator to participate in electronically tracking the participant during the fitness activity

determining a location of the participant during the fitness activity using the portable fitness device;

determining a location of the spectator during the fitness activity using a mobile spectator device; and

sending a first alert to the spectator at the spectator device during the fitness activity based on the spectator location and the participant location, wherein the first alert indicates that the participant is within a first predetermined distance of the spectator, and wherein sending the first alert occurs after a determination that an acceptance of the invitation has been received,

wherein at least one of sending the invitation, determining the location of the participant, determining the location of the spectator, and sending the first alert is performed using at least one processor.

22. The method of claim 21 , comprising:

sending a second alert to the portable fitness device during the fitness activity based on the spectator location and the participant location, wherein the second alert indicates that the spectator is within a second predetermined distance of the participant, and wherein sending the second alert only occurs in response to a determination that an acceptance of the invitation has been received.

23. The method of claim 21 , wherein sending the first alert only occurs in response to a determination that an acceptance of the invitation has been received before a beginning of the fitness activity.

24. A computer program product comprising a non-transitory computer useable medium having computer program logic stored therein for causing one or more processors to track a pre-identified participant engaged in a fitness activity who is pre-identified by a spectator, the computer program logic comprising:

first computer readable program code for determining a location of the pre-identified participant during the fitness activity based on data received at a portable fitness device used by the pre-identified participant;

second computer readable program code for determining a location of the spectator during the fitness activity based on data received at a mobile spectator device used by the spectator;

third computer readable program code for determining whether the spectator is registered to track the pre-identified participant; and

fourth computer readable program code for sending a first alert to the spectator at the spectator device during the fitness activity if the spectator is registered to track the pre-identified participant, wherein the first alert is based on the spectator location and the pre-identified participant location, and wherein the first alert indicates that the pre-identified participant is within a first predetermined distance of the spectator.

25. The computer program product of claim 24 , comprising:

fifth computer readable program code for sending a second alert to the portable fitness device during the fitness activity if the spectator is registered to track the pre-identified participant, wherein the second alert is based on the location of the spectator and the location of the pre-identified participant, wherein the second alert indicates that the spectator is within a second predetermined distance of the pre-identified participant.

26. A method of tracking a participant engaged in a fitness activity who is pre-identified by a spectator, comprising:

determining a location of the participant during the fitness activity based on data received at a portable fitness device used by the participant;

determining a location of the spectator during the fitness activity based on data received at a mobile spectator device used by the spectator;

sending a first alert to the portable fitness device during the fitness activity based on the spectator location and the participant location, wherein the first alert indicates that the spectator is within a first predetermined distance of the participant; and

sending a second alert to the spectator at the spectator device during the fitness activity based on the spectator location and the participant location, wherein the second alert indicates that the participant is within a second predetermined distance of the spectator, wherein at least one of determining the location of the participant, determining the location of the spectator, sending the first alert, and sending the second alert is performed using at least one processor, and

wherein at least one of the first alert and the second alert is based on participant athletic performance data and provides a representation of the athletic performance data.

27. The method of claim 26 , wherein the athletic performance data comprises heart rate data of the participant.

28. The method of claim 26 , wherein the athletic performance data comprises acceleration data.

29. The method of claim 26 , wherein the athletic performance data comprises at least one of pedometer data, pulsimeter data, breath rate data, gyroscope data, magnetometer data, hydration data, and thermometer data.

30. The method of claim 26 , wherein the athletic performance data comprises heart rate data, and

wherein at least one of the first alert and the second alert is triggered by the heart rate data exceeding a heart rate threshold.

31. A method of tracking a participant engaged in a fitness activity who is pre-identified by a spectator, comprising:

determining a location of the participant during the fitness activity based on data received at a portable fitness device used by the participant, wherein the location of the participant is measured based on a position of the participant relative to a route;

determining a location of the spectator during the fitness activity based on data received at a mobile spectator device used by the spectator;

sending a first alert to the portable fitness device during the fitness activity based on the spectator location and the participant location, wherein the first alert indicates that the spectator is within a first predetermined distance of the participant; and

sending a second alert to the spectator at the spectator device during the fitness activity based on the spectator location and the participant location, wherein the second alert indicates that the participant is within a second predetermined distance of the spectator, wherein at least one of determining the location of the participant, determining the location of the spectator, sending the first alert, and sending the second alert is performed using at least one processor.