1: "Simone Biles, US gymnast, makes history with 21st world title win."

2: "Biles' record-breaking achievements in gymnastics continue to inspire."

3: "The athlete's talent and dedication shine in every routine."

4: "Fans worldwide celebrate Biles' remarkable accomplishments."

5: "Embracing challenges, Biles pushes the boundaries of gymnastics."

6: "21 world titles - Simone Biles cements her legacy in sport."

7: "Exceptional skills and unwavering commitment define Biles' career."

8: "Simone Biles' dominance in gymnastics sets a new standard."

9: "Congratulations to Simone Biles on her 21st world title victory!"