sprung floor
n.β Β«One of the cooler aspects of this new auxiliary gym is it has whatβs called a “sprung floor,” which helps takes the stress off of peopleβs legs while theyβre here playing basketball or volleyball.Β» ββInside the Phoenixβs New Fitness Center” by Adam Aaro WBAy-TV (Green Bay, Wisconsin) Sept. 19, 2007. (source: Double-Tongued Dictionary)