I have just conducted an AET test with one of my athletes and just wanted to sense check my interpretation of the data with you guys. She ran outside for 60 minutes on a flat course and her starting HR was around 142. The average HR for the first 30 minutes was around 138 and for the second 30 minutes 140, The average pace for the run was 6:31km. Am I right in saying that this shows a less than 1% drift comparing the two halves and that this run was well under her AET? Should I re-test and get her to start at a slightly higher HR/Pace? It was also interesting that she said she felt like she could run forever so another sign this was well under AET.