Half a croissant, on a plate, with a sign in front of it saying '50c'
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Bicepedal Transformer

Ling envisioned "some kind of link." (See [link] for more info.)
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When you are in midstride, the arm that protrudes is opposite to the leading leg. The protruding arm is on the same side as lagging leg, which should be in midair.

As depicted, the the thigh slips into one cuff, and the forearm/wrist slips into the other. Guided by a few plastic rings on a specially designed shirt, a semi-stiff, bungee-ish cord goes up the lats, around the shoulder and finally down to the hamstring. It stays on one side of the body.

When one forearm protrudes, the bungee cord pulls the back of the hamstring up and back, which should allow the arms to contribute to the forward motion. Because the forearm pull starts while the lagging foot is still on the ground, the cord will aid the glutes in pulling the leg backwards. (You can also see in the diagram that the left arm is bent behind the body. As it shoots forward, it, too, will pull the left leg back, while the left leg is on the ground.) One must adjust his or her arm swing in order to maximize efficiency.

NOTE: The ring on the back may have to extend out a bit further than is shown on the diagram, in order to provide more horizontal force.

ALSO NOTE: The diagram shows the right leg after it is FINISHED exertion, and is ready to move forward again. The red arrows indicate that the bungee HAS moved, (and NOT that it is going to move), in the direction depicted. (A device that pulls your back leg over your head wouldn't help your running.)

Cuit_au_Four, Feb 01 2006

Figure 1 http://www.sfu.ca/~...mg/bungeerunner.gif
Graphical Representation. [Cuit_au_Four, Feb 01 2006]

Jogging Energy Saver Jogging_20energy_20saver
Ling's posting. [Cuit_au_Four, Feb 01 2006]

[link]






       That is so not going to work. Building a little bit more muscle mass on the legs would be far more effective. That said, I love it and may give it a go. How about a hybrid of this and Ling's where the cord goes over the shoulder and thus harnesses some of the downward movement of the arm (jogs along hallway and back) Yes, it might kind of work. I can also imagine an energy recovery bra along similar lines. +
spidermother, Feb 01 2006
  
      
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