Having just got to level 46 on training, I noticed that instead of improving my training options by adding an extra whistle, on one of the options was a "globe" - taking the ranking from Pro to World Class. The globe can be seen over the Warm Up schedule below.
I just assumed that after three whistles that would be it - so to unlock the globe was an interesting surprise - and will also mean it will take a lot longer to "max out" the training packages, which I think is a very good thing.
Is there any more to be locked after globes? Maybe 2 globes, or something completely different....