This October, former Colts tight end Dallas Clark will be running 26.2 miles, swimming 2.4 miles and biking another 112 miles, all in a single race.
It's an Ironman Challenge, with a target goal in mind: He's looking to raise $2 million to split between the Peyton Manning Children's Hospital and the University of Iowa Stead Family Children's Hospital.
To get ready for such an undertaking, he'll run the 500 Festival Mini Marathon on Saturday in Indianapolis. Back in the city where he played nine NFL seasons, Clark will train for the ironman challenge and recruit as many donors as he can.