Related Clues:
- Muscles strengthened by planking
- Muscles worked by situps
- 'Washboard' muscles, informally
- Muscles tightened by planking, in brief
- Muscles targeted by planks
- 'Washboard' features
- Crunch time target?
- They work in a crunch
- Six-pack (abbr)
- Muscles that stretch during pregnancy
- 'Ripped' muscles
- Cobra pose muscles
- Six-pack units, in brief
- Oblique neighbors
- Targets for crunches, informally