Strengthen your core and sculpt your abs with this four-move dumbbell workout. Trainer Sandy Sklar demonstrates each exercise to help you perfect your form and maximize results.

For this workout, you just need one of the best yoga mats and a resistance band or loop band for one of the exercises. If you ...

Living host, Jaclyn Friedlander goes to Crunch Fitness and works out with a trainer Irv Gotti, music producer and Murder Inc.