Butterfly propulsion is driven by coordinated whole-body motion — not isolated arm strength. The kinetic body wave creates timing, alignment, and trunk stability, allowing the arms to act as secondary levers against the water. When the spine, core, and lower body are sequenced correctly, the arms finally apply force in the right place, at the right time, from top to bottom. 🐬⚡️ . . #BondiBlade #SwimCoach #ButterflyStroke #SwimTechnique