For everyone that made fun of her dancing abilities not being as sharp as the used to be during FF and Circus read these. The fact that britney is still outperforming her contemporaries after over 3 knee injuries since 1998 says a ton about her. Most athletes would never work again after the 3rds time.
1998 before the sometimes video... They had to postpone it.
2004 the onyx hotel tour - this was the beginning of her major knee injury before outrageous