Kettler RACE Mode D'emploi page 17

Biomechanics
The pronation describes the natural cushioning of the foot for
absorbing the impact. The pronation of the foot can be different
depending on the type of runner. One distinguishes between
normal pronation, overpronation and supination.
For a runner with a normal pronation a running shoe should
always support the natural pronation movement, however wit-
hout limiting it due to stability technologies. Mainly the overpro-
nation or the supination are a big problem for runners and can
lead to diverse injuries. However, suitable running shoes can
balance individual malpositions or problems.
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