apGet ready to challenge yourself with fitness trainer Natalie Whitea, who will be leading this 30-minute total-body HIIT workout joined by Madisyn Sloane Maniffa and Luisa Fonsecaa. In this routine, you'll start with a dynamic warmup that will activate your arms, legs, and core muscles. Then, you'll increase the intensity throughout the workout with plank holds, shin taps, jump lunges, and so much more. This nonstop routine will have you sweating in no time. And rest assured, White will provide plenty of modifications and advancements so you can tweak the moves to meet your needs.