A participant takes part in an air mattress surfing competition in Vienna, Austria, on Aug. 1, 2020. (Photo by Georges Schneider/Xinhua)
A participant takes part in an air mattress surfing competition in Vienna, Austria, on Aug. 1, 2020. (Photo by Georges Schneider/Xinhua)
A participant takes part in an air mattress surfing competition in Vienna, Austria, on Aug. 1, 2020. (Photo by Georges Schneider/Xinhua)
A participant takes part in an air mattress surfing competition in Vienna, Austria, on Aug. 1, 2020. (Photo by Georges Schneider/Xinhua)
A participant takes part in an air mattress surfing competition in Vienna, Austria, on Aug. 1, 2020. (Photo by Georges Schneider/Xinhua)
A participant takes part in an air mattress surfing competition in Vienna, Austria, on Aug. 1, 2020. (Photo by Georges Schneider/Xinhua)
A participant takes part in an air mattress surfing competition in Vienna, Austria, on Aug. 1, 2020. (Photo by Georges Schneider/Xinhua)
A participant takes part in an air mattress surfing competition in Vienna, Austria, on Aug. 1, 2020. (Photo by Georges Schneider/Xinhua)