If you pick one healthy thing to change in your life, physical activity is likely to make the fastest change in how you feel and also potentially reduce your cancer-related risks. Make opportunities to walk or take stairs. Find an exercise program to join to get you started if it’s just too hard to do alone. Check your local YMCA for a LIVESTRONG exercise program if it’s just too hard to do alone. Check your local YMCA for a LIVESTRONG exercise program near where you live.