This May, kick off your 31-Day Challenge and support breakthroughs at Children's Hospital of Philadelphia. The 31-Day Challenge app will not only connect to Apple Health Kit to track your physical activity but also allow you to update your fundraising page, send e-mails, check your progress to goal and much more- all from the palm of your hand.

Please note: The 31-Day Challenge iPhone application is only available to current registrants of the event. If you haven't registered yet for this year's event, please go to 31days.chop.edu to register.