Liam Henry's father-in-law, Gav, was diagnosed with Parkinson's disease at 38 and is now 51.
Henry met him through his brother, who worked alongside Gav, and says his attitude has inspired him.
"He has every reason to, but he doesn't."
"I might have a tough day at training, but you come back, and you see him not complaining."
"I draw a lot of motivation from him [in that way]. He's wonderful."
In his final fortnight at Penrith, Henry will run the Nepean River route he knows from his time at the club, raising awareness for Parkinson's disease.
On October 10, six days after the NRL grand final, he plans to cover 65km in 10 laps, and anyone can join him for a lap or two.
Henry sees the run as a way to mark his departure from the club that shaped him, on his own terms and for a cause beyond football.