运 (traditional 運) moves 辶 with 云 (cloud) as the sound — and what image could suit motion better than clouds crossing the sky? Transport, circulation, and the turning of fortune all flow from 'movement'.
运 moves goods and destinies alike: 运动 (sports/exercise — 'movement'), 运气 (luck — the drift of fortune's clouds), 幸运 (fortunate). The Grand Canal is the 大运河, the artery that moved an empire's grain. Before exams, students wear red for 好运 (good luck); the Olympics are the 奥运会. Whether it's cargo, cardio or karma — if it moves, it's 运.
Clouds 云 on the move 辶 — TRANSPORT, and the drift of LUCK.
运气 'moving qi' = luck: fortune in Chinese is weather — it drifts, it turns, it passes.