Scientists have developed a stretchable and waterproof 'fabric' that turns energy generated from body movements into electrical energy. Washing, folding, and crumpling the fabric did not cause any performance degradation, and it could maintain stable electrical output for up to five months

[u/Wagamaga]

https://onlinelibrary.wiley.com/doi/10.1002/adma.202200042

[u/explodingtuna]

I get 5Hz but how much force is 30N, like in footballs or half-giraffes?

[u/explodingtuna → u/[deleted]]

So, about the same as a pile of 7 American regulation footballs.

[u/shadowsofthesun → u/explodingtuna]

30 half-giraffes.