Whether you're overweight or not, exercise can reduce bad cholesterol and increase good cholesterol. With your doctor's OK, work up to 30 to 60 minutes of exercise a day. Take a brisk daily walk during your lunch hour. Ride your bike to work. Swim laps. Play a favorite sport. To maintain your motivation, find an exercise buddy or join an exercise group. And remember, any activity is helpful. Even taking the stairs instead of the elevator can make a difference.