Do you know that protrusions on the sole of a shoe is called cleat?
No i dont, wow, so why is it called a cleat?
They are called cleat because  they  provide additional traction on a soft or slippery surface.
wow, good to know, do you prefer flat shoes or hilly shoes?
Flat works for me. In the USA,  we use synecdochically to  refer to shoes featuring such protrusions 
wow, so why do majority of females wear hilly shoes?
, in British English the term 'studs' can be used to refer to 'football boots' or 'rugby boots' which have studs.
History.
It is thought that during the Roman Empire, Roman legionaires wore studded sandals that resembled cleats. See Caligae.
Athletes have worn cleats since at least the 1500s. Although there are no images or surviving examples of cleats from that time period, the first written documentation of cleats comes from 1526, when "football boots" were listed in King Henry VIII
Cleat (shoe)
Cleats or studs are protrusions on the sole of a shoe, or on an external attachment to a shoe, that provide additional traction on a soft or slippery surface. They can be conical or blade-like in shape, and made of plastic, rubber or metal. The type worn depends on the environment of play, whether it be grass, ice, artificial turf, or other grounds.
In American English the term cleats is used synecdochically to refer to shoes featuring such protrusions. Similarly