jump, dance, leap, skip
踴 centers on lively, upward movement: jumping, leaping, skipping, or dancing with energy.
踴 combines 足 (foot) with 勇, which likely contributes the sound and the idea of vigorous movement. The exact historical development is uncertain.
The foot radical 足 suggests movement, and 勇 brings a sense of bold energy. Picture a brave foot leaping and dancing with fearless jumps.
For ヨウ, imagine a yo-yo bouncing up and down like a jumping foot: yo-yo -> ヨウ, and the foot dances with each leap.