Related Clues:

• Horse _____
• It goes to the swiftest
• "Amazing" contest of reality TV
• A long one may have several legs
• Go pitapat
• It may be on its last leg
• 5K, for one
• Human ___
• Quickness contest
• Hearts and minds can do it
• Dash or marathon
• Word with "human" and "rat"
• 5K, say
• Indy 500, e.g.
• Iditarod, for one