1. A method for providing audio performance feedback to a user during an athletic activity using a portable fitness monitoring device comprising the steps of: (a) the portable fitness monitoring device receiving one or more audio feedback files; (b) the portable fitness monitoring device generating audio performance feedback during the athletic activity by reference to an index, wherein the index is associated with the one or more audio feedback files; and (c) the portable fitness monitoring device providing the audio performance feedback to the user during the athletic activity audibly through an audio output device.