Coach Rebecca demonstrates the exercise of the week. Changing plank. From high plank position, touch your head for one count, as shown. Return to start position. Then touch your opposite shoulder as shown, return to start. Bring one leg out to the side, hold for a count, return to start. Finally bring one knee up as shown, and return to the start. Repeat until you get fatigued. To increase difficulty, add in different moves (hip touch, or reach to the ceiling for example).