1. US Gymnastics Championships in Boston

2. Simone Biles competes on the vault during the US senior women’s competition at US Gymnastics at TD Garden on Aug. 17. (Matthew J. Lee/Globe Staff)

3. Sam Mikulak during his floor excercise routine during the US senior men’s competition on Aug, 18. (Matthew J. Lee/Globe Staff)

4. Riley McCusker during the uneven parrellel bars competition on Aug. 19. (Matthew J. Lee/Globe Staff)

5. Simone Biles warms up for her floor excercise routine on Aug. 19. (Matthew J. Lee/Globe Staff)

6. Sam Mikulak celebrates after his parrellel bars routine on Aug. 18. (Matthew J. Lee/Globe Staff)

7. Simone Biles during her vault attempt at the US senior women’s final round of competition on Aug. 19. (Matthew J. Lee/Globe Staff)

8. Allan Bower on the rings on Aug. 18. (Matthew J. Lee/Globe Staff)

9. Simone Biles on the balance beam on Aug. 17. (Matthew J. Lee/Globe Staff)

10. Donnell Whittenburg on the rings on Aug. 18. (Matthew J. Lee/Globe Staff)

11. Morgan Hurd releases from the uneven parrellel bars during the US senior women’s final round of competition on Aug. 19. (Matthew J. Lee/Globe Staff)

12. Donothan Bailey release from the horizontal bars on Aug. 18. (Matthew J. Lee/Globe Staff)

13. Riley McCusker on her vault attempt during the US senior women’s final round of competition on Aug. 19. (Matthew J. Lee/Globe Staff)

14. A gymnast plants his hands on the vault on media day. (Stan Grossfeld/Globe Staff)

15. Sam Mikulak, as seen in a multiple exposure, during the high bar exercise. (John Tlumacki/Globe Staff)

16. An overhead of the floor at TD Garden. (Stan Grossfeld/Globe Staff)

17. Alexei Vernyi flies through the air. (Stan Grossfeld/Globe Staff)

18. Olympic champion Simone Biles smiles at another gymnast. (Stan Grossfeld/Globe Staff)

19. A gymnast performs on the parellel bars. (Stan Grossfeld/Globe Staff)

20. A gymnast on the balance beam. (Stan Grossfeld/Globe Staff)

21. Senior women competitors warm up. (Barry Chin/Globe Staff)

22. A gymnast claps powder off his hands before performing. (Stan Grossfeld/Globe Staff)

23. Cannon Johnson flies through the air. (Stan Grossfeld/Globe Staff)

24. Senior women warm up. (Barry Chin/Globe Staff)

25. Riley McCusker stretches. (Stan Grossfeld/Globe Staff)

26. Donothan Bailey practices on the rings. (Stan Grossfeld/Globe Staff)

27. Gymnasts wait for their turn to practice. (Stan Grossfeld/Globe Staff)

28. A gymnast tapes his foot. (Stan Grossfeld/Globe Staff)

29. A gymnast chalks her hands and feet. (Barry Chin/Globe Staff)

30. Simone Biles flies through the air. (Stan Grossfeld/Globe Staff)

31. A gymnast grips the high bar. (Stan Grossfeld/Globe Staff)

32. Lillian Lippeatt stretches on the mat. (Stan Grossfeld/Globe Staff)

33. Skye Blakely on the balance beam. (Stan Grossfeld/Globe Staff)

34. Morgan Hurd during a light moment at practice. (Barry Chin/Globe Staff)

35. Nick Kuebler stretches with a coach. (Stan Grossfeld/Globe Staff)

36. A gymnast watches another at practice. (Stan Grossfeld/Globe Staff)

37. A gymnast soars in front of the seats at TD Garden. (Stan Grossfeld/Globe Staff)

38. A gymnast flies through the air. (Stan Grossfeld/Globe Staff)

39. Olympic champion Simone Biles is surrounded by media members. (Stan Grossfeld/Globe Staff)

40. Grace McCallum flips on the balance beam. (Stan Grossfeld/Globe Staff)

41. Riley McCusker and Emma Malabuyo hug after practice. (Stan Grossfeld/Globe Staff)

42. A gymnast flips while practicing on the rings. (Stan Grossfeld/Globe Staff)

43. A gymnast hurtles through the air while practicing on the vault. (Stan Grossfeld/Globe Staff)