Get a workout that's customized for your goals, habits, heart rate, and music taste
Once you're geared up to sweat, you let Vi know (via app, or just speaking aloud into the headset) what sort of workout you're looking for. Want to burn more fat? Improve your running form? Train for a half marathon? Just let her know and she'll adjust accordingly.
During my demo, I asked her to target my ideal heart-rate zone. Once she clocked my resting heart rate, I hopped on the treadmill. As I slowly increased the belt speed per her instructions, she queued up a Coldplay song via Spotify, whose beats per minute matched the pace she wanted me at -- counting off my steps on top of the beat like a metronome to ensure proper form. As she had me speed up she chirped some words of encouragement until I eventually reached my heart-rate goal and began a cool-down.
The whole encounter was surprisingly natural and left me feeling amped. I probably would have opted for a different soundtrack (sorry, Chris Martin), but Vi was paired with the developer's phone instead of mine at the time. Otherwise it would have pulled tracks from my Spotify or Apple Music accounts.
Over time, Vi's software "learns" your workout habits, adapts to your changing needs, and keeps you challenged. Like a real-life trainer she'll occasionally text you in between workouts to make sure you're not slacking. And if she kicks your butt one day, she might follow up with a text later in the day to see how you're feeling, or remind you to get a good night's sleep before a day when she's slated a big race-training run for you. Vi also keeps tabs on the weather, so if it's miserable outside she'll hit you up to suggest you work out indoors rather than skip out altogether.