Foot radical on the left puts 践 in the family of walking/stepping verbs - to tread, to fulfill (literally to walk through a promise). Same radical groups it with 跑 (run), 跳 (jump), 跟 (follow), 路 (road).
戋 supplies the sound - jiān drifting to jiàn - and appears across a tight phonetic family: 钱 (money), 浅 (shallow), 笺 (slip of paper), 贱 (lowly). Recognizing this five-stroke unit unlocks pronunciation for the whole series.
