Related Clues:

• Core components, for short
• Curl-up muscles
• Muscles used while planking
• Parts of the body that are 'crunched'
• Rowing exercise targets
• Targets of many pilates exercises
• Core features
• Washboard __
• Core workout targets
• Muscles in a six-pack
• Muscles in 'packs'
• Situp muscles
• Short muscles?
• Six-pack contents?
• Stomach muscles, familiarly