<qa>  What is the name of the activity monitor that you will be given to you after your first studyAfter your first study visit, you will be given an activity monitor and instructions to wear it on your waistband or belt like a pedometer, during the time you are awake, for 7 days in a row. The activity monitor will record your daily activity. At the end of the 7 days, you will be asked to return the activity monitor using a pre-addressed, postage-paid return envelope that you will be given to you with the monitor. 