Parallel bars
Sports Dictionary
La Rochefoucauld: "Stubbornness is born of the limitations of our minds: we are reluctant to believe what goes beyond our horizons."
– apparatus used in artistic gymnastics. The parallel bars consist of two oval-section bars, which are hinged to the stands. Men compete on parallel bars, and women on uneven bars (bars located at different heights). 
Related to terms referring to sports equipment
Other definitions in the section "Gymnastics terms"
La Rochefoucauld: "Stubbornness is born of the limitations of our minds: we are reluctant to believe what goes beyond our horizons."