Shakira and J. Lo are promising a high-energy performance at this year’s Super Bowl Halftime Show. The singing sensations posed with the first official game balls at a news conference ahead of Sunday’s big game. The two stars seem to have found the fountain of youth. J. Lo is 50 and Shakira turns 43 on Super Bowl Sunday. We talked to Shakira's longtime personal trainer, Anna Kaiser, who has the star working out six days a week to get ready for the show.