There are several synonyms for the phrase "exercise of memory", including memorization, retention, recollection, retention, and remembrance. Each of these words has a slightly different connotation, with some emphasizing the act of actively committing information to memory (memorization), while others focus on the ability to recall that information later on (recollection, retention, remembrance). Regardless of which word is used, the importance of exercising one's memory cannot be overstated. Regularly challenging your memory through activities such as puzzles, games, and memorization exercises can help improve overall cognitive function and may even help stave off cognitive decline in old age.