Related Clues:

• Muscles that get crunched
• Butterflies work them
• Situps tighten them
• Bench presser’s pride
• Midsection, in brief
• Crunch focus
• V-sits work them
• They get harder the more you work out
• 'Crunched' muscles
• Muscles strengthened by planking
• Muscles worked by situps
• 'Washboard' muscles, informally
• Muscles tightened by planking, in brief
• Muscles targeted by planks
• 'Washboard' features