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An interest of mine has always been to combine workouts with technology, and this is one of the ideas I've had.

I've always felt that working out at a gym should be integrated with the world around us, and what better way to do that then connecting it to the power grid? This is the Power Dumbbell, simply a regular exercise dumbbell which is connect to a dynamo and a battery. This can then connect to your buildings power supply so that you can later use the electricity you've generated. Or why not connect it directly to your laptop as an incentive; if you want to sit still all day you've got to move your ass first! Of course the weight of the dumbbell is adjustable.

Some quick calculations showed that this device could roughly generate 5-10 watt in normal use (see below). It's not much, but it's a start. Here's a quick render I did to give you an idea of what it would look like:


E = m*g*h

m = 10 g (mass of the dumbbell)
g = 9,82
h = 0,65 m (the height the dumbbell is lifted)

E = 10 * 9,82 * 0,65 = 63,83 Joule

If the user does a normal 10 times 3 workout (does 10 lifts, rests, then 10 more etc.) in a 5 minute period that gives us:

t = 60 * 5 = 300 s (time)
E = 30 * 63,83 = 1915 J

P = E / t = 1915 / 300 = 6,38 Watt.

Of course this is just one hand, I normally work out the other hand as well in those 5 minutes, which would double the electricity generated.

Views: 124

Comment by Adam Sunman on March 18, 2010 at 3:56pm
great idea ! +1 creativity !
Comment by Jen Shaffer on March 19, 2010 at 4:47pm
You've got some really creative ideas Per. Any thoughts on how to harness all that energy from joggers? And not on treadmills? I run every day. It would be great if somehow I could capture some of that energy through shoe inserts or arm movements or whatnot.
Comment by John D. Boyden on March 19, 2010 at 4:48pm
ROTFL *applause* +1 creativity. Great rendering... I er um will watch YOU do that!
Comment by Brian Ballsun-Stanton on March 20, 2010 at 2:15am
Can you set variable resistance? Would it be possible to generalize this into an emergency USB source?
Comment by Per Jonsson on March 20, 2010 at 8:50am
Brian, to both your questions:


Of course the weight of the dumbbell/resistance will be adjustable. And installing a USB extension might be a good idea, for all the tech that recharges via computers.


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