Related Clues:

• Belly muscles
• 'Six-pack' muscles
• Car safety feature, for short
• 'Washboard' muscles
• Units in a six-pack?
• Workout target, for short
• Muscles
• Chin-ups and pull-ups develop them
• Sit-up beneficiaries
• They may be ripped on the beach
• Tummy muscles, for short
• Sit-ups sculpt them
• They work at crunch-time
• Six-pack units
• Pecs' neighbors