跳皮筋 ("jumping the elastic") is a classic Chinese schoolyard game, especially for girls in the 1980s-1990s. Two children hold a long elastic band stretched between their legs while a third hops through patterns.
memory
皮 (skin/leather/rubbery) + 筋 (tendon/sinew) = "rubbery sinew", a vivid, tactile name for an elastic band.