The rigidity in the forefoot can be unique to the individuals mechanics in this model of midsole and geometry which makes for a fun and smooth ride throughout. The result is a pretty natural feeling ride that still has some responsiveness and flexibility integrated in. The system is dynamic and operates as one piece as the same midsole. This is essentially what ProFly midsole does. This demonstrates that the foot and ankle is not as simple as a spring and load mechanism, but rather it is a dynamic system that is highly time dependent on loading and stiffness. Oleson, Adler, & Goldsmith (2005) found that during toe off, forefoot stiffness will significantly increase but then taper off steadily. They found that forefoot stiffness is unique to the individual and that some may respond better to more firm or more flexible forefoot regions in the shoe. One major example would be the research done over at Saucony looking at forefoot stiffness. A lot of different running companies are now looking at rigidity in specific portions of the shoe and how it effects the ride and performance.
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