ball

Let's see them graduate to medicine balls, then it will be impressive. But there's no doubt this takes a bit of skill and balance, or this would end up as one of the next fail videos pasted all over the internet. Not exactly sure which part of the body they are exercising here, but let's give them the benefit of the doubt, and assume they have some use for this besides for laughs. But these struggling gymnasts might want to take a lesson or two from these guys with control, he might save himself some more pain. 

A projector mounted above the surface provides context to the shapeshifting pins, giving them color and highlighting depth. In a video released by MIT, the table is shown moving a ball, mirroring a book, displaying 3D charts, and giving an extremely visible smartphone notification.

NICE CATCH!