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Related Clues:
- Lumbar spine flexors
- Six-pack to be proud of
- What sit-ups work
- They're below the pecs
- Core muscle group
- "Crunched" muscles, briefly
- "Crunched" muscles
- Pilates target
- They might be ripped
- Torso muscles, briefly
- Stomach muscles (abbr)
- Plank target
- Crunches tone them
- Midriff muscles, briefly
- Muscles strengthened by belly-dancing