Related Clues:

• Spry
• Full of ginger
• Gracefully athletic
• Nifty
• Like a stereotypical little old lady in tennis shoes?
• Dexterous
• Mentally alert
• Perceptive
• Hardly heavy-footed
• Deadlock
• Sharp-witted
• Quick on one's feet
• Like Jack-be-nimble
• Fleet-footed
• Not slowing down a bit