The Batman- Further "Brucejitsu"

The driver popped the trunk and hurried to fetch Bruce’s luggage, but the seventeen-year-old beat him to it. “I got it,” Bruce said, lifting the leather bags out of the trunk.
...

  Building on the “Brucejitsu” Alfred had taught him, Bruce studied martial arts with masters in different countries, borrowing moves and tactics from each discipline, becoming a truly dangerous fighter. No matter where he was living, he always found a way to keep strengthening his body. Sometimes he worked out in sleek gyms with gleaming equipment. Sometimes he lifted milk jugs filled with sand.
…

  Now in his late twenties, Bruce was back living in Wayne Tower.

- Before the Batman, Chapters One and Twelve