According to Japanese law, bicycles driving at night must be equipped with light-emitting devices. For example, it is very common to use lighting generated by thermal energy generated by friction between tires and circuit devices. If it is a large-scale human generator, please refer to the pictures in the resources. Http://sbc21.co.jp/enterprises/shore I/2002/07 jitennsya/jitennsya.html This is a Japanese paper, which is about the study of bicycle-generated generators. If you still don't understand, you can keep asking me. I haven't seen the video material you mentioned, but according to the existing online articles, human power generation is still widely used, and like solar power generation, it is also being promoted and tested. At the same time, human-powered generators are constantly being developed and tested as disaster prevention supplies for Japan to cope with natural disasters such as earthquakes and tsunamis. Other applications include, for example, flashlights that utilize the storage capacity of lithium batteries by turning the handle, (

) and 100 low-power PDA (

) and so on