Move #6: Core Twists
Dietzen saves the hard stuff for last. Like these challenging abdominal twists that use his body weight, and more, for resistance.
Brian's Fit Tip: Aim for 50 twists. You can just clasp your hands together, and rotate to touch the ground on either side, or add in an eight pound medicine ball for extra challenge.
Photo credit: Monty Brinton/CBS