Related Clues:

• Hard-working without rubber on bikes it's said
• Full of stamina
• Permanently lively girl tours country and gets thrown out
• Unflagging
• Having great energy
• Indefatigable, but unable to drive across America?
• Having inexhaustible energy Les tries exercising
• Hard-working trader initially calm
• Indefatigable team leader lacking passion
• Indefatigable, unflagging
• Energetic Eli rests, surprisingly
• Unwearied
• Never wearying
• Unflagging elders regularly engaged in mysterious rites
• Hugely energetic