1: "Meet Simone Biles, the record-breaking US gymnast."

2: "Simone Biles secures her 21st world title in gymnastics."

3: "Breaking barriers, Simone Biles excels in every competition."

4: "Simone Biles continues to dominate the gymnastics world."

5: "Simone Biles' talent knows no limits, with 21 world titles."

6: "US gymnast Simone Biles sets new records with 21st world title."

7: "Simone Biles is unstoppable, claiming her 21st world title."

8: "Witness greatness: Simone Biles' 21st world title win."

9: "Simone Biles' journey to 21 world titles is nothing short of extraordinary."