What part does physics play in the desingn of running shoes ?

Explanation

Each person s foot is different and each person runs in a different way . Each time an average runner s foot stricks the ground , the vertical component of its momentum redues to zero , requiring a large impules . To reduce the stress of this load on the leg and foot of the runner , the time of impact has to be increased . Athletic shoes have four parts : the upper section , the midsole and the out sole . the uppers are usually made of light weight materials that breathe. The midsole, which is sand wiched between the insole and outsole is the most important part of the shoe. it cushions the foot increasing the time of impact and absorbs part of the force on the runner ' s body . A recent desingn provides two sets of air cylinders placed beneath the insole, over the midsole .