Has anyone ever heard of them sparring for training? On one hand it would seem the most/best obvious choice for keeping each other fit along with training, I mean what better way to train for an upcoming fight than to spar the OTHER best heavyweight in the world for FREE?
But I guess on the other hand if they're really adamant about not fighting each other ever then this would cross a line.
Has anyone ever heard of/saw them spar and if so what was the outcome?

But I guess on the other hand if they're really adamant about not fighting each other ever then this would cross a line.
Has anyone ever heard of/saw them spar and if so what was the outcome?

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