Most brigades don't have access to a structure to burn down, and hence can't test out how far they can push themselves, while dressed in PBI Gold....
Having some activity, where crews work physically hard, while dressed in their PBI Gold, might give them an idea of how hot they get, while working hard....
I'd hate to have my crews go out, to a going structure fire, dressed in PBI Gold for the first time...... (since not everyone who has done a BA Course, has done it in PBI Gold)
Pip