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[–] prairie 0 points 1 point (+1|-0) ago 

If efficiency is the goal, I've got a much better solution this engineer might want to take a look at.

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[–] Deceneu ago 

That's how the idea came to him. By riding along runners on a bike, then noticing the efficiency differential.

I guess the only worthwhile goal would be to 'run for your life'.

Competition wouldn't allow it and it'd be less of a workout in general.