The shoes themselves are made of flexible material, typically featuring a sole made of dense rubber. While the original design was basic, manufacturers have since tailored athletic shoes for the different purposes that they can be used for. A specific example of this is the spiked shoe developed for track running.
High-end marathon running shoes will often come in different shapes suited to different foot types, gait etc.
There are a variety of specialized shoes designed for specific uses:
The British English term "trainer" derives from "training shoe". There is evidence [1] that this usage of "trainer" originated as a genericised tradename for a make of training shoe made in 1968 by Gola.
Plimsolls (English English) are indoor athletic shoes, and are also called sneakers in northeastern American English and daps in Welsh English. The word "sneaker" is often attributed to Henry Nelson McKinney, an advertising agent for N. W. Ayer & Son, who, in 1917, coined the term because the rubber sole made the shoe stealthy. All other shoes, with the exception of moccasins, were unsuitable for sneaking due to the noise they inevitably produced. However, the word was in use at least as early as 1887, as the Boston Journal of Education made reference to "sneakers" as "the name boys give to tennis shoes".