The dolphin kick is swimming’s not-so-secret weapon—used by elite swimmers to gain serious speed off every wall. In this guide, I break down how to build a powerful, efficient dolphin kick by focusing on core strength, ankle flexibility, and technique drills that deliver real results. From shaving seconds off race times to improving efficiency during underwater phases, a well-trained dolphin kick can be a true game-changer. I’ll walk you through practical tips, videos, and training progressions to help you develop a race-winning kick - one that starts at your core and finishes with faster, smoother swims.