running shoes vs studs

running shoes

noun
  • Sneakers, not cleats; tennis shoes; normal gym shoes. 

  • Trainers with sharp spikes in the soles. 

studs

noun
  • A pair of shoes or boots which have studs on the bottom to aid grip. 

  • Tires with metal protrusions used for improved traction on snow and ice in winter. 

How often have the words running shoes and studs occurred in a corpus of books? (source: Google Ngram Viewer )