Bungee cords are made. Usually, depending on where you live. By aspecialist who specifies in bungee cords. There are 2 types of modern day cords. Spec cords and the NZ cord. Spec cords are a military type of cord and only stretch to twice there length. Meaning if you want to jump 20', you need a 10' spec cord. Also spec cords are not very forgiving. Usually the sheath that surrounds the rubber in the cord has a stop distance that is twice the distance. Once its been reached it stops abruptly. The second and most commonly used around the world, the NZ cord is a tight bunched of elastics that are specially made to stretch 400% there size. Meaning if you have a 200lbs person and they want to jump 100'. You would need 25' of nz cord, that has at least 200 wraps in it. The science of the cord is very specific. The number of wraps in the cord very, depending on the weight of the person jumping. The larger the cord the more weight is needed to stretch it.
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Sometimes people tie one end of very long bungee cords to bridges, and the other end to their leg, and then jump from the bridge. MOST times the bungee cord, stretched to its maximum, flexes back, saving the person from certain doom. And this is called "Bungee jumping". But, as this is a human exercise, sometimes it all ends SO tragically.