I'm done with allowing athletes like Farah, Rupp tell me that thyroid hormone isn't cheating. It is! Normal people have to deal daily fluctuations in hormone levels and metabolism in response to training but with thyroid hormone you stay perfectly constant without having to worry about this aspect of normal human physiology.
The line was finally crossed for me when I learned that a teammate of mine got a prescription for thyroid hormone this past year. This guy has never been able to beat me and now he's killing me in workouts and races. He's now somehow been able to lose weight, put up ridiculous miles and says he never feels tired.
This stuff is just legalized PEDs!