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Japan is turning footsteps into electricity
(lemmy.world)
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this post was submitted on 28 Feb 2026
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Cycling and rowing machines are probably the only practical options for that - they both have intentional friction brakes to dissipate energy, because they are actually efficient enough to need them.
Treadmills still need to put power in because of the friction, and most weight or spring machines rely on you absorbing the energy you just put in (unless you drop the weights...)