Related Clues:

• Muscles targeted by planks
• Situp's target
• 'Washboard' features
• Crunch time target?
• Essence (sometimes hard)
• 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
• Abs' muscle group
• Muscles worked by dead bug exercises