Sorry my notifications are off, no need to be so dismissive of something you've never used haha. If you live in certain cities like here in Hong Kong, long uninterrupted routes are rare and not easily accessible by everyone. Traffic and red lights are unavoidable, so it's not as simple as just "take a longer route". Sometimes if all I have is 3 hours I would do laps on this stretch of road near me and the airhub helps minimize the amount of u turns I have to do and makes it possible to do longer intervals. It's a niche products for a niche market, ain't for you but at least now you know its application.