Luck was part of it. Working eight performances a week for months on end was the rest. In her years as “Dolly,” she regularly battled laryngitis. Once in the mid-1980s, during a performance of “Legends!”, a comedy about feuding actresses that co-starred Mary Martin, Channing tripped over a stage prop, fell, broke her arm, got up and went on with the show.
Source: latimes.com – Los Angeles Times