Runner's World (UK) - - Tested Rw Shoe Lab -

Flex­i­bil­ity is an ex­cel­lent in­di­ca­tion of how smoothly a shoe will move with the foot from heel strike to toe-off. We mea­sure this in the lab by se­cur­ing a shoe’s fore­foot to a ma­chine that bends it 45 de­grees – about the same as the foot flexes nat­u­rally on the run – 60 times in 20 sec­onds. The force re­quired to do this in­di­cates how pli­able the shoe is.

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