Here is a mockup of the concept. The first couple pages are example settings for widgets and tools which only show up initially. The final one is the dashboard itself which would show on normal login.
In addition to a simple dashboard that combines all GB resources into one place, the site would offer a workout log, simple tools to track height/weight, and notes.
Because it's also a satellite domain, we'd get extra boost towards SEO for the main GB site. And since we're pulling content from GB.com we are effectively double dipping for traffic .