Check out these behind the scenes shots of actor Sean Astin!
The busy actor, director and producer talks about racing, cross training and how he wants everyone to run for a cause with #Run3rd.
Many well-known names will be running for charity.
He joins New York Rangers star Nick Kypreos.
Here are some famous faces that competed in track and field before they made a name for themselves elsewhere.
Actor Sean Astin to lead the sold-out field.
Giants wide receiver Amani Toomer is taking part in it.
"Sam" from the Lord of the Rings will be in the Magic Kingdom.
Additional celebrities expected to enter in the coming weeks.
She completed her first marathon in March.