Primitive Technology, the channel that inspired all those faked terrible “building stuff in the woods” channels, but the original is really good.

Wenn man es geschickt anstellt, könnte man das evtl sogar lokal im E-Perso machen, ohne dass man überhaupt eine staatliche API benutzen muss.

That is just plain wrong. People that switch over to cycling and are successful within a few years are athletes from other disciplines. You can not build up the necessary cardio to be an olympic level cyclist in just a few years.