Just like previous installments, Assassin's Creed III lets you use the free run mode. By holding down the appropriate button, you can jump between roofs of buildings, climb trees or quickly avoid obstacles. The system has been improved, so that unplanned moves happen as rarely as possible.
While in free run, Connor will never automatically perform a jump which can cause him to fall or lose health. In order to jump down from a high place, you will need to press the jump button. The same button can be used for quick climbing and jumping above small obstacles automatically (by holding down the button and running into them).