“Don’t limit your challenges. Challenge your limits” is a motivational saying that has been printed on many images. The saying has been used in classified advertisements since at least January 1987.
 
The saying was popularized as the slogan of Jerry Dunn, who has been called “America’s Marathon Man” for his marathon-running. Dunn was credited with the saying in Newsday (Long Island, NY) on October 15, 1988.
   
       
4 January 1987, Detroit (MI) Free Press, pg. 1E, col. 2 classified ad:
Don’t Limit Your Challenges…Challenge Your Limits
(...)
BEST EXECUTIVE MARKETING
 
24 January 1988, The Sun (Baltimore, MD), pg. G24, col. 2 classified ad:
DON’T LIMIT YOUR CHALLENGES…
CHALLENGE YOUR LIMITS
(...)
MEDICAL PERSONNEL POOL
     
15 October 1988, Newsday (Long Island, NY), “Running: Thriving On Daily Dose Of Marathon” by John Hanc, pg. A74:
Jerry Dunn couldn’t stop to talk to us. He had a marathon to run, as usual.
(...)
On Marathon Sunday, he’ll don a shirt with his slogan “Don’t Limit Your Challenges, Challenge Your Limits,” and who could argue that Dunn has done anything but?
     
19 October 1998, New York (NY) Post, “Another Day, Another 26 Miles for Marathon Man” by Gersh Kuntzman, pg. 20:
Today, Jerry Dunn will run his 16th marathon.
 
Big deal, you say? Think again: This isn’t the 16th marathon of Dunn’s life - it’s the 16th marathon of Dunn’s last 16 days.
(...)
His other catch phrase? Don’t limit your challenges; challenge your limits.
   
Google Books
Where Should I Sit at Lunch?:
The Ultimate 24/7 Guide to Surviving the High School Years
By Harriet S. Mosatche and Karen Unger
New York, NY: McGraw Hill Professional
2006
Pg. ?:
A motivational quote reads, “Don’t limit your challenges, challenge your limits.” Think beyond what you usually do and what you feel you are capable of doing, and move forward.
   
Google Books
A Passion for Running:
Portraits of the Everyday Runner
By Scott Ludwig
Bloomington, IN: iUniverse
2009
Pg. 235:
DON’T LIMIT YOUR CHALLENGES: CHALLENGE YOUR LIMITS
By Jerry Dunn
 
Twitter 
Eleanor Prior
@VAGirlFriday
I like this RT @KikiValdes DO NOT LIMIT YOUR CHALLENGES, CHALLENGE YOUR LIMITS http://tinyurl.com/b5wgdn
7:45 PM - 10 Feb 2009
   
Twitter
Lasimppan
@lasimppan
Replying to @KikiValdes
DO NOT LIMIT YOUR CHALLENGES, CHALLENGE YOUR LIMITS http://tinyurl.com/b5wgdn (via @KikiValdes)
12:31 AM - 9 Mar 2009
   
Twitter
Marvin Towler
@MarvinTowler
Don’t limit your challenges - challenge your limits.~Specht
11:40 AM - 28 May 2009
     
Google Books
Cracking Into Super Brains With 6000 Supreme Quotes
By Vivek Mathur
New Delhi, India: Studera Press
2017
Pg. 95:
Don’t Limit Your Challenges… Challenge Your Limits. - Author Unknown
 
Linkedin
AMERICA’S MARATHON MAN
Published on May 22, 2017
Jerry Dunn
Runner, Entrepeneur, Event Consultant, Motivational Speaker
(...)
Don’t Limit Your Challenges…........Challenge Your Limits
 
Twitter
Burton Brown Sr.
@BurtonBrown
Don’t limit your challenges.
Challenge your limits.
~Unknown
#quote
via @RomanJancic
3:43 AM - 11 Jun 2018