Tri Zones Training

Founded by Sally Edwards, Heart Zones USA is the authentic and original heart-rate training system. Heart Zones USA creates, develops, and applies the use of heart rate data and monitors for health, fitness, and enhanced performance. Heart Zones has spent the last 15 years creating systems and programs for individuals and organizations, and specialty applications for weight management, emotional fitness training, swim-bike-run training, schools, hospitals, and much, much more.
http://www.heartzones.com/