aquaerobics

Etymology tree
Proto-Indo-European *h₂ékʷeh₂
Proto-Italic *akʷā
Latin aquabor.
Middle English aqua
English aqua-
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
English aquaerobics
From aqua- + aerobics.