Ryan Reynolds (left) and Michael J. Fox
Dominique Charriau/WireImage; Michael Loccisano/FilmMagic
10/09/2008 AT 01:30 PM EDT
is an adventurous guy: He just took the plunge and now he's ready to risk bloody nipples.
Last month, the actor married Scarlett Johansson
in an intimate wedding in Canada
. Now the Definitely, Maybe
star is tackling the New York City Marathon on Nov. 2, according to an open letter he wrote on The Huffington Post
"I am not a runner," writes Reynolds, 31. "I am a running joke. Waking up at 4:30 a.m. and jogging anywhere from 11 to 23 miles has been nothing short of horrifying."
Reynolds – a spectator in years past – admits he was amazed by the sight of "guys coming in to finish with bleeding nipples ... People were crying. People were limping, hobbling, screaming, crawling. But most importantly, people were experiencing a sublime rapture that I couldn't even hope to understand."
Ultimately, he signed up for the race after meeting Michael J. Fox, and is running to raise money in the fight against Parkinson’s disease
. The main reason behind his efforts? "On behalf of my Father, Jim Reynolds, who's spent the last 15 years in a life or death struggle with Parkinson's Disease," explains Reynolds.
Mired in the grind of marathon training, he writes, "Not since the discovery of Junior High School has a torture been so effective. It's my hope the story of my father combined with my own goal of becoming the first person in history to sob uncontrollably for 26.2 miles straight, may inspire you to give something too."
He concludes with invites to donate to his cause or another one, as well as, "come down and watch. Feel free to bring a smile, automated defibrillator, or a fresh set of nipples."
See Ryan's 'sexiest' moment!
2007: Katie Holmes runs the NYC Marathon