There are a few ways to impact your metabolism on a day to day basis - exercise is one way to boost your metabolism, and interestingly, eating breakfast when you first wake up will actually increase your metabolism.
Most people have a metabolism in the normal range. The exception to this is people with low thyroid. In this case, the metabolism is very slow, and medication can help boost it to normal levels. If your'e finding that you're very tired, cold, and have an excessively slow metabolism, get your thyroid levels checked, so you can confirm whether you have normal thyroid levels.