Dynaseat ingeniously harnesses untapped energy from the all-too-common subconscious leg bounce to generate and store electricity


Our ‘deep-seated’ society and culture contribute to heart complications, the leading cause of death globally.


Instead of trying to change one’s sedentary lifestyle, the aim is to invite healthy movement in a sitting experience to aid in the prevention of heart-related health problems. Dynaseat encourages the users to leg-bounce: a subconscous habit that protects blood vessels in legs and protects against arterial diseases, improves concentration and reduces stress. Since the leg-bounce is subconscious, Dynaseat is designed to harness the habit’s ‘free’ kinetic energy. I began by investigating various existing technologies such as hand-crank generators  including dynamos, alternators, and hand-pressure fans (below). They all have one thing in common: they transform mechanical stress into an electric charge.

Hand-pressure Fan
Dynamo Torch
Alternator Lantern

The works-like prototype below is a combination of the technologies working in cohesion. The hand-crank mechanism from the torch and the dynamo and circuitry from the lantern were essential to Dynaseat’s development during lockdown.

Works-like prototype of custom generator that harnesses linear movement to generate and store electricity
Exploded View of rendered foot-crank, gears & dynamo


Dynaseat encourages the subconscious leg-bounce or fidget habits by harnessing their kinetic energy to generate electricity. If the sitter remains active, they will generate electricity which is stored in a built-in battery, and can then later be used to charge a phone, power a light, or if implemented on a grander scale such as a restaurant or office, it could power much more. The generator is also servicable by the consumer just in case any of the components become dysfunctional.

Render of foot-rest actuating the custom dynamo via a rack and gear system

The chair’s tubular steel frame serves as a convenient housing to route wires from the foot-rest, up to the armrest where the USB ports are located. The frame which serves as the chair’s supporting base also provides simple and clever circuitry integration.

Wire route throughout chair
Armchair components (USB port * battery indicator LEDs)
USB port
Designed for replacement of faulty components

Countersunk screws are inserted in a threaded hole on the bottom of the steel tube. The screw is inserted deep into the seat/backpost to conceal the entire screw

Close-up view of tubular steel frame, seat and armrests

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