Speed, agility, better fascial fitness, a stronger core, better abs and better overall aerobic performance are the building blocks of fitness. Cardio & Core Express has all of that. Bounce on the balls of your feet throughout. Raise your knee to waist height during Knee-to-Elbow exercises and make sure you employ a full length straight-arm movement during Jumping Jacks and you have the kind of workout that jumpstarts your fitness every time you do it.