Related Clues:

• The centre part, as of an apple
• The centre of an object
• The innermost part
• Centre, heart
• See how crude this is in the middle
• Ones crunched during crunch time?
• The heart of the military body, by the sound of it
• Auto safety device, for short
• ''Crunched'' muscles
• Infomercial ''after'' photo
• Muscles covering some 32-Down
• Gym rat's 'six-pack'
• Blood groups
• Rock-hard ones might be a turn-on
• Sit-ups' targets