When Alicia Keys sings "This girl is on fire," she's not just talking about a blazing personality. She may also be talking about her abs and quads after her bootcamp-style workouts with celebrity trainer Jeanette Jenkins. The singer is dedicated to her healthy lifestyle, even tweeting regularly that she does circuit training, sprints and weighted exercises with the fitness guru. Jeanette throws in yoga to keep Alicia's muscles long and lean while improving flexibility and core strength. The two even worked out the morning of the Grammys, tweeted Jeanette. That's dedication. Remember, the morning of your next big event, get out for a run and some plank exercises, just to tone up one last time.