AN EXERCISE PLAN FOR A 70 YEAR OLD WOMAN. A woman over the age of 70 needs 150 minutes of moderate activity weekly, according to the Centers for Disease Control and Prevention. During moderate activity, you will break a sweat but still have a conversation. Examples of this type of activity include taking a brisk walk, riding a bicycle on level ground or gardening in your backyard. Aqua aerobics is another option for moderate activity.