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Kristin says: She regularly does this long-and-lean crunch to help keep her abs flat.
Start on floor in plank position, balancing on forearms and toes, forming a straight line from head to heels.
Lift right arm off floor and extend it forward at shoulder height as you lift left leg behind you so that it's parallel to floor, toes pointed. Hold for 10 counts, then lower to return to plank. (MAKE IT EASIER: Raise right arm, hold for 10 counts, lower. Raise left leg, hold for 10 counts, lower.)
Switch sides and repeat to complete 1 rep. Do 10 reps.