"I wanted to challenge myself physically - it seems to me that if I don't drop dead, a 500 mile stroll should do the trick - and see if I couldn't generate some funds for a good cause at the same time," Boyle says.

"There are any number of worthy causes I could have chosen for this project, but Indiana Children's Wish Fund has always been special to me. I've been involved with the Wish Fund for a long time, and I've seen how these children face often untenable situations with courage, determination, and resolve that is nothing short of inspirational. "

To support Mark in his cause, please visit http://thewishwalk.com.