Purpose: Butterfly requires core stability in the anterior saggital plane. This strength allows the athlete to keep their body weight forward and hips up throughout the stroke. This exercise helps improve the anterior saggital plane strength, as the athlete engages their latissimus dorsi muscles. Directions: Start in the push-up position, but with your ankles pointed. Next, have the athlete contract their abdominals, then push their body off the ground, attempting to move forward. While doing this, have the swimmer keep their core tight and hips high. Also, ensure their chick is tucked and in a straight line.