Related Clues:

• Back muscles, in the gym
• T-bar rows work them
• Muscles worked by rowing
• Back muscles, informally
• Core muscles, for short
• Lumbar spine flexors
• Six-pack to be proud of
• What sit-ups work
• They're below the pecs
• Core muscle group
• "Crunched" muscles, briefly
• Targets of pulldowns
• "Crunched" muscles
• Pilates target
• They might be ripped