The new TomTom Runner Cardio is a brilliant device.

It's a GPS watch that tracks your heart rate while you run, without you having to don a lovely, sweaty chest strap.

You could say it is, therefore, "strapless."

And because the folks at TomTom are apparently marketing geniuses, they've taken advantage of this excellent "strapless" feature to create an even more excellent video.

The premise? A pretty girl running in slow-motion while wearing a strapless top.

See what they did there?

To answer your next question - yes, Alexandria Morgan is on Instagram.