I used my Sunnto to track the workout and it shows the training story. The 3 red dots on the bottom is when the t6c was stopped and we transition from bike-run-bike-run. The top chart is my heart rate and the bottom is the EPOC/Training Effect. With a long training day I took it easy on the first bike, but you see the spike on the first run. After that everything settled in and the second bike and run was a steady climb. I ended the session with a Training Effect of 3.9, which means a Highly Improving workout.