VIDEO : This Workout Routine Keeps J. Lo In Killer Shape

Jennifer Lopez has been a fitness icon for over 20 years. The "Booty" singer makes exercise a priority by working out in the morning. She embraces brief, intense sessions. She uses a stability ball to enhance ab and arm exercises. Lopez also keeps her workout routine fun by bringing her boyfriend along. She incorporates activities that she loves, like dancing. She says exercise is a "key to happiness" and takes time to rest after pushing herself.