A grand total of 4,568 participants from 10 counties are registered for the Grand Health Challenge, which kicked off on Tuesday evening in the St. Marys junior/senior high school auditorium. Team members weighed in and went through some light aerobic exercise. The fitness program is sponsored by Grand Lake Health System and runs through May 22. Correction: The Grand Lake Health Challenge has 560 participants. The overall total for the past 11 years is 4,568. The error was made in reporting.