A good example of elastic strain energy while running in bipeds is from those who run with 'Blades'. Whilst Para-Olympic runners with below knee amputations have lost all of the explosive energy of their plantar flexors (calf muscles), what they now gain is the energy conservation of the ground forces from the design of the blades.
Oscar Pistorius, during the 2012 London Olympics complained that a co-competitor had an advantage over him because he had longer blades which gave him a longer stride.
But that competitor had lost more of his lower leg, so the blades are to make up for lost height, but I assume they both have equally lost the use of their calf muscles. The officials ruled it as fair, what is your opinion?
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