You can measure strength in various ways. Some people are physically strong and can lift heavy objects or climb walls. Others are mentally strong and use their minds to overcome obstacles.
The Fourth Annual Rockford Ninja Warrior event brought 16 out of the 30 professional ninjas from the television show, American Ninja Warrior, to Spectrum Health Helen DeVos Children’s Hospital on a recent afternoon.
See additional photographs and read more about the American Ninja Warrior stars’ special visit.