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Related Clues:
- Targets of many pilates exercises
- Core features
- Washboard __
- Core workout targets
- Muscles in a six-pack
- Muscles in 'packs'
- Situp muscles
- Short muscles?
- Six-pack contents?
- Stomach muscles, familiarly
- Targets of leg raises, informally
- Beneficiaries of exercises called Russian twists
- Prominent features on firefighter calendars
- Torso muscles
- Washboard muscles