Training on the 'Black Board' involves initially distributing weight equally (50/50) between both legs to assess the ability to distribute weight through the foot's intrinsic musculature.

“the way you want to start training with something like this is all of your weight on the two legs equally so 50 50 weight here and all you really want to be doing is just seeing that you have the ability to even distribute weight through the intrinsic musculature of the foot”