The dream of mechanical cushioning started in 1984. It was then that bio-mechanical experiments with the goal of optimizing energy return began. First, Nike designers and engineers added steel springs to a running shoe’s midsole to see if it would improve running economy. A year later, they trialed a multi-layer leaf-spring heel unit to see if they could find the sweet spot of cushioning and stability. Experiments on different hinges and mechanical columns continued throughout the rest of the 1980s.
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