Related Clues:

• 'Washboard' muscles, informally
• Muscles tightened by planking, in brief
• Muscles targeted by planks
• Cable row targets, for short
• '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
• Muscles below the shoulder blades, briefly