跳皮筋 (tiào píjīn) — '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.
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皮 (skin/leather/rubbery) + 筋 (tendon/sinew) = 'rubbery sinew' — a vivid, tactile name for an elastic band.
