What kind of martial arts was boxing in ancient China?

Routine is only the most superficial part of boxing. Only routine movements are not called boxing, but only "routines".

Tai Ji Chuan, Xingyiquan, Baguazhang, Tongbei Boxing, Shaolin Boxing, wudang boxing, First Class Boxing (Dacheng Boxing), Bajiquan Boxing, Nanquan (self-created boxing system, from Nanshaolin Boxing, Wing Chun Boxing, Mantis Boxing, Hong Boxing, Natural Boxing, Psychological Boxing, Guagua Boxing, Wuzu Heyang Boxing, Drunken Boxing, Sewing, Fanzi Boxing.

In short, China Wushu is an ancient kind of boxing except Sanda, Jeet Kune Do, women's self-defense, military boxing, police-bandit fighting and modern capture.