It feels like everyone is wearing a fitness band these days. That’s partly because they’ve managed to succeed where so many approaches fail: they’re getting people to pay attention to how active (or inactive) they are — and to work at doing better. Now consider your company and your customers (or your employees). There are things you want to encourage them to do: save regularly, get check-ups, take medicine, purchase updates. How can you follow the fitness band model to make that happen? What can you develop — an app, an email program, a device — that encourages success and gently nudges them into compliance.