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Engage core, move opposite arm and leg. Mistakes: Arching back, not controlling movements.

Engage core, reach side to side. Mistakes: Not engaging core, not reaching far enough.

Move knees to chest in plank position. Mistakes: Dropping hips, not engaging core.

Lift legs to 90 degrees, engage core. Mistakes: Using momentum, not engaging core.

Hold plank position on side, engage core. Mistakes: Collapsing hips, not engaging core.

Hold plank position, engage core. Mistakes: Sagging hips, not engaging core.