Breaking the surface of the water with the feet is allowed unless followed by a downward dolphin kick.

The legs perform a dolphin kick and while the arms move in a forward circle at the same time.

Similar to elementary backstroke, but with a dolphin kick.

I played with the backstroke dolphin kick in high school, but my legs weren't strong enough.

After first dolphin kick, pull both arms immediately with downward motion.

After first dolphin kick, raise both arms with relax.

The arms are extended but do not move, and the feet employ a dolphin kick borrowed from the butterfly stroke.

This dolphin kick is essential for many top athletes because it is the fastest part of the race.

Stewart learned to dive down 9 feet at the start of a race, keep his arms straight out and use the butterfly's standard dolphin kick.

After Riley's trial heat, a stroke judge reported she had used a downward dolphin kick, which is illegal.