Zwift: An online training app, with actual results.

I saw an article on BBC Click yesterday (just before the Man Utd game), and the presenters predicted that this App will be very popular in 2021. It already has 1 million downloads and growing fast. Very fast.
The BBC Click clip is not on YouTube yet, but here is an advert that explains how it works:

https://www.youtube.com/watch?v=LBXnYW6yX_Q

Waturedio ghasia peana summary si kila Mtu ako na WiFi.

It seems very interesting and fascinating actually. You will need;
A bike or a treadmill
A PC, smart TV or iPad
The app
Somehow, the App is linked to the gadgets (bike or treadmill).
Once you start running/cycling, you will see yourself doing the same on the screen going through hill, valleys etc.
You can even compete with professional, virtually of course or with your online community( like cheki maneno team of @Meria Mata)
Heck, there is even actual prize for the winners including cash awards. According to BBC Click, a participant from UK recently won a virtual race and got $10,000.

Saw it on Click very interesting mpaka kuna cheating just like the real thing plus the cash rewards are great ! You can really get hooked and stay super fit

How do you sync it to the bike? Is a gadget needed?

haha
saw it day one.
rode a race in california with helmet cam

Not sure.
@Meria Mata how does it work?