Answer:

ABS

Answer	Crossword Clue
ABS	Bodybuilder's concern
ABS	Certain muscles
ABS	Crunches strengthen them

ABS	Iron pumper's pride
ABS	Bodybuilder's group
ABS	Crunch benefactors
ABS	Crunched items?
ABS	Crunches' target
ABS	Report-card abbr.
ABS	Situps strengthen them
ABS	Situps toughen them

ABS	Stomach muscles, for short
ABS	Workout target
ABS	Charles Atlas' muscles
ABS	Crunches work them
ABS	Gym focus
ABS	Targets of planks
ABS	Prominent feature on "Magic Mike" posters
ABS	Belly muscles, for short

ABS	Tummy muscles
ABS	Sit-up targets
ABS	What crunches work
ABS	Sit-up muscles
ABS	Six-pack muscles
ABS	Crunch targets
ABS	"Sixpack" muscles
ABS	Washboard, maybe

ABS	Gut "six-pack"
ABS	Target of crunches
ABS	Midsection muscles, casually
ABS	6-pack muscles?
ABS	Flat ones are desired
ABS	He-man's "six-pack"
ABS	Six-pack components, say
ABS	He-man's "rock hard" muscles

ABS	Muscles to crunch
ABS	Belly muscles
ABS	Sculpted body parts
ABS	Stomach muscles
ABS	Six-pack set