Hi, Are you interested in improving your personal fitness? We are recruiting participants for a health study which records your step count, and delivers motivational messages as phone notifications. We are interested in recruiting people of all ages, backgrounds, and fitness levels. Participants need to be enrolled in the National Steps Challenge. You will be asked to share your step count data for analysis, and may be asked to download a mobile app (iPhone or Android). If you are interested, please fill out this recruitment survey!