quadrobic

Etymology tree
Proto-Indo-European *kʷetwóresder.
Proto-Indo-European *kʷetwr̥-
Proto-Italic *kʷetru-
Proto-Indo-European *ped-
Proto-Indo-European *-s
Proto-Indo-European *pṓds
Proto-Italic *pets
Proto-Italic *kʷetrupōts
Latin quadrupedembor.
French quadrupèdebor.
English quadruped
Proto-Indo-European *h₂el-der.?
Proto-Italic *-ālis
Latin -ālisbor.
Old French -albor.
▲
Latin -ālis
Old French -elbor.
▲
Latin -ālisbor.
Middle English -al
English -al
English quadrupedal
Proto-Indo-European *h₂ews-
Proto-Indo-European *h₂ewsér
Proto-Hellenic *auhḗr
Ancient Greek ἀήρ (aḗr)
Proto-Indo-European *gʷeyh₃-der.
Ancient Greek βίος (bíos)
French aérobie
Proto-Indo-European *-ikos
Proto-Italic *-ikos
Latin -icuslbor.
Old French -iquebor.
Middle English -ik
English -ic
English aerobic
Old English -as
Middle English -es
English -s
English aerobics
blend?
English quadrobicsbf.?
English quadrobic
Possibly a back-formation from quadrobics.