leg extension bar
/ˈlɛɡ ɛkstˈɛnʃən ˈbɑː/
n
English · leg extension bar中文 · 腿屈伸杆Español · barra de extensión de piernasFrançais · balancier d’extension
意味：Lying on the back with the legs under the bar, the user lifts the legs to the horizontal position, using the front thigh muscles.