SPRI Exercise Aquatic Heart Rate ChartSPRI Exercise Aquatic Heart Rate ChartSPRI Exercise Aquatic Heart Rate ChartSPRI Exercise Aquatic Heart Rate ChartSPRI Exercise Aquatic Heart Rate ChartSPRI Exercise Aquatic Heart Rate ChartSPRI Exercise Aquatic Heart Rate ChartSPRI Exercise Aquatic Heart Rate ChartSPRI Exercise Aquatic Heart Rate ChartSPRI Exercise Aquatic Heart Rate ChartSPRI Exercise Aquatic Heart Rate ChartSPRI Exercise Aquatic Heart Rate ChartSPRI Exercise Aquatic Heart Rate ChartSPRI Exercise Aquatic Heart Rate ChartSPRI Exercise Aquatic Heart Rate ChartSPRI Exercise Aquatic Heart Rate ChartSPRI Exercise Aquatic Heart Rate ChartSPRI Exercise Aquatic Heart Rate ChartSPRI Exercise Aquatic Heart Rate ChartThis large, simple to read, laminated, water resistant Heart Rate Training Chart uses Heart Rate Reserve method to determine 60% and 85% heart rate training zones. The Aquatic Adjustment of 17 beats per minute is used when calculating 6 and 10 second target heart rate zone beat equivalence. Corresponding color-coded rating of perceived exertion also included. Size: 22" x 30"