80/20 Endurance data fields

Creating these datafield was inspired by the "80/20 Training System" invented by D. Warden and M. Fitzgerald (www.8020endurance.com). The datafields give visual feedback to the athlete to get brief information about the training zone he/she is currently running at. This helps to plan and train more effectively and you do not have to tinker with the preset training zones of your GARMIN watch.