noun
Refers to the activity of running, especially as exercise or sport. Common in compound words like ランニングマシン (treadmill) and ランニングコース (running course).
毎朝、公園でランニングをしている。
I go running in the park every morning.
Abbreviation of ランニングシャツ. Refers to a sleeveless shirt worn as underwear or sportswear. In Japanese, this is a common casual term for a tank top, especially men's undershirts.
See also: ランニングシャツ
夏はランニング一枚で過ごすことが多い。
In summer, I often spend the day in just a tank top.
スポーツ用品店でランニングを買った。
I bought a tank top at the sporting goods store.