The recommended cholesterol levels for adults are no more than 200 milligrams or cholesterol per deciliter of blood, according to the National Institute of Health's Medline Plus website. This total cholesterol level should comprise at least 60 milligrams of high-density lipoprotein (HDL) per deciliter of blood and no more than 100 milligrams of low-density lipoprotein (LDL) per deciliter of blood. These are known as "good" and "bad" cholesterol, respectively.
One way to lower LDL levels and raise HDL levels is to exercise for at least 30 minutes per day, as outlined on the Medline Plus website. Some other ways to maintain safe cholesterol levels are to consume less saturated fat and lose weight. Age, gender and genetics also affect cholesterol levels, with men over the age of 45 and women over the age of 55 being at greater risk of elevated LDL levels.