每天清晨，林醫生都會沿著護城河步行上班。從東關街到中心醫院，三公里的路程他走了十五年，鞋底磨出的紋路里，藏著城市變遷的密碼。

初春的河岸最是熱鬧。晨練的老人打太極時，褲腳會掃過剛冒芽的薺菜；穿校服的學生背著書包奔跑，驚起蘆葦叢里的麻雀；賣早點的三輪車停在石橋邊，油條的香氣混著河水的潮氣，構成最鮮活的市井氣息。林醫生記得十年前這里還是臭水溝，現在岸邊種滿了垂柳，傍晚常有情侶依偎看夕陽。

穿過菜市場時，總能遇見賣豆腐的張嬸。她的木板車上擺著嫩豆腐、豆腐干和豆腐皮，蓋著的棉布永遠雪白。“林醫生早啊！” 她麻利地切著豆腐，“今天的豆漿熬得稠，要不要帶一碗？” 這種無需刻意維系的熟稔，是步行帶來的意外溫暖。

老城區的胡同像迷宮，林醫生卻閉著眼睛都能找到路。墻根下的月季何時開花，哪家院墻上的爬山虎最茂盛，他都了如指掌。有次搶救急診病人，救護車堵在路口，他硬是背著急救箱穿過三條胡同，提前十分鐘趕到現場。“這些路救過我的命，也幫我救了別人的命。”

傍晚下班，他常繞路去看那棵老槐樹。樹齡三百多年，樹干要三人合抱，枝椏在青灰色的屋頂上伸展。去年臺風過后，樹枝斷了不少，居民們自發來綁扎固定。現在新葉又掛滿枝頭，樹下的石凳上，總有老人在下棋，孩子在追逐嬉鬧。
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林醫生的運動鞋換了一雙又一雙，手機里的計步器記錄著累計的里程。他說步行的意義，不在于步數多少，而在于能觸摸到城市的脈搏 —— 那些開車飛馳時錯過的細節，那些藏在街角巷尾的人情味，構成了城市最真實的溫度。