Related Clues:
- Six-pack group
- 'Six-pack'
- Core muscles, briefly
- Muscles targeted by crunches
- What sit-ups build
- Corporeal stabilizers
- Crunches work them
- Muscles targeted in core workouts
- Muscles used in a Russian twist, for short
- Midsection muscles
- Part of the body that crunches work
- When they're ripped, they're strong
- Muscles in sit-ups, informally
- Muscular sextet
- Pull-up beneficiaries