This is an industrial designed exercise bike from Lithuania that can store 2KWh of electricity generated by your own exercise.
The electricity can then be used for loads of stuff - it has a bunch of DC outputs, like USB-C (up to 60W) and USB-A, and AC outputs (can output up to 2KW - enough for an oven!)
It can also be fed from a solar panel, or the mains.
It’s about 3K EUR, so not much more than a high end Peloton , but obvs serving a *very* different market…