"Travel back and forth" is a common phrase used to describe the act of frequent round trips to a particular location. However, there are several synonyms that can be used to convey the same meaning. These include "shuttle," which can be used to describe a frequent back-and-forth journey between two points. "Commute" is another synonym that's commonly used to describe traveling back and forth between work and home. "Pendulum" can also be used to describe the repetitive motion of traveling back and forth between two points. Other synonyms for "travel back and forth" include "tread" and "traverse".