Related Clues:

• Work the muscles
• Electrical cable
• Work hard enough
• Show off, as one's muscles
• Leverage
• Flaunt, say, as muscles
• Expand and contract
• Put forth, as energy
• Push (oneself)
• Show off at the gym, say
• Show off one's bod
• Put out (effort)
• Use, as power
• Wield, as power
• __ time