Painters are able to operate a brush for full working days in the studio without the elbow support that a desk supplies here. It seems if the benefit is great enough people can work up the supporting muscles through repetition.
In fact, if a painter (or user of Leap) were to continually rest their elbow on some support, they could compress the ulnar nerve and cause cubital tunnel syndrome. If you've ever hit your "funny bone," that's the ulnar nerve.
Heck, consider how light a painter's brush is in comparison to a fencer's epee (which only weighs about 1 lb at the most, but still, try holding one for an hour without having any experience!)
