Related Clues:

• 'While there's . . . . there's hope'
• Capacity for action
• Power or vigorous activity
• Vigour or power
• Vigour, animation
• Capacity for activity
• 'While there's .... there's hope'
• Vigour, power
• Get-up-and-go, vitality
• Vigour, vitality
• Vigour, vim, vitality
• Healthy capacity for vigorous activity
• Exertion of force
• It's measured in joules
• It's measured in joules or ergs