I notice when i have added the MTB Marathon plan it will show the graph over time in the performance management area that will show the estimated CTL/ATL and TSB. The problem is some of the prescribed numbers in the workouts are almost impossible to hit. For example a 5 hour ride at .90 IF with a 405 Score is almost impossible to hit and thus it throws off this number. I am not sure who can ride at .90 IF for 5 hours unless you are a super high level cyclist. Are these numbers provided in the plan accurate? I mean a 5 hour ride at .80 would be pretty difficult but also doable. I know several racers that over the course of a marathon or epic race race at about a .7-.75 IF. I understand you need to push yourself to get better but also some of the long ride numbers do not seem realistic.