Related Clues:

• Joint activity?
• Electrical cable
• Show off, as one's muscles
• Flaunt, say, as muscles
• Expand and contract
• Show off at the gym, say
• Show off one's bod
• __ time
• Show off your guns
• Tighten, as muscles
• Work one's biceps
• Show off one's muscles
• Bend, as muscles
• Bend one's elbow, e.g.
• Bend, as an elbow