What is the arm movement pattern in butterfly?

• A. Catch with palms in, pull straight back, recover under the body.
• B. Reach forward, then push away, then recover behind the back.
• C. Rotate wrists and push water with thumbs.
• D. Catch with palms out/down, pull in a semicircle, and recovery over water.

Answer: (D)

Butterfly arm action relies on both arms moving together through a catch, a broad semicircular pull, and a recovery above the water. As the hands enter the water, they are positioned to grab water with the palms facing outward and slightly downward. From there, the arms move back in a wide, curved path driven by the shoulders and elbows, pulling the water toward the hips in a semicircular motion. The recovery lifts the arms out of the water and forward above the surface, with the elbows leading, so the hands re-enter together in front of the head for the next cycle. This sequence—catch with palms out/down, pull in a semicircle, and recovery over the water—best matches how the butterfly stroke is styled and paced.

Other descriptions miss the essential pattern: catching with the arms in, pulling straight back and recovering under the body isn’t how butterfly’s recovery works; butterfly uses an over-water recovery. A description like reaching forward then pushing away and recovering behind the back doesn’t reflect the synchronized, simultaneous arm action or the over-water recovery. And focusing on rotating wrists and pushing with thumbs brushes past the main mechanics, which involve a broad, semicircular pull and a deliberate, above-water recovery.