Possible Clues:

• Healthy but stringy-looking?
• In great shape to be orchestra leader?
• In the pink!
• Extremely healthy
• Volunteers recruited by motor-racing appeal do very well
• In perfect health
• Attach a bike seat housing if turning very healthy
• Paddy regularly jams with a stringed instrument in good condition
• What item must do to go into violin case very well?
• Healthy (like a violin?)