I didn't intend to imply that Jan was hiding her skills, even though Toby obviously was hiding his, but I can see how that implication does exist in the story. I think the development of the "hidden talent" aspect that characters display in some stories is what inspired me to give this obsession to Toby.

In most of these stories, the hero trains in secret for some mission or as part of a strategy to catch an opponent off-guard. I think Toby did it because he wanted to make a big splash maybe, suddenly appearing on the professional dancing scene and out-dancing everyone else as a newcomer. The ultimate claim to fame!

But he sacrifices all of that when he gets so turned-on by Jan, which makes him kind of heroic, in a way.