In the fifth installment of our six-part core challenge, Tonal Instructors Dr. Liz Letchford & Coach Paul Wright take you through movements to ramp up rotation in your center. This workout consists of Russian twists, mountain climbers, kick throughs, crossover crunches and more —all designed to help you to activate your core and strengthen your rotation. So grab a mat, a bottle of water, and get ready to challenge yourSELF!