In December of 2009, I wrote about local fitness company Expresso - the maker of an interactive workout machines that I was blown away by. Here's the next wave - which should become more commonplace and eventually will be built into all sorts of machines. Our local gym (the Palo Alto JCC) has the iPod / iPhone connectors for their cardio machines. Those adapters charge your device while working out... but more importantly, they allow you to run media to the machines' individual screens (which can be attached or built in monitors - both examples are below). So, users can stream Netflix to their machine's monitor, access iTunes files, or supply a soundtrack to the native fitness application.
It's proof on just how prolific Apple devices are (this is not merely a mini-usb port).
It is also an indication of where fitness machines are moving - it is not difficult to imagine the machine being able to push content to your phone... or to a specific application.
And lastly, it is not difficult to imagine that this occurs via bluetooth in near future (just as it does in new cars and in products like the Jambox).