“Sweat is (just) fat crying” is a popular saying that has been oriented on many gift items, such as T-shirts and posters. “Sweat is fat crying” has been cited in print since at least May 2011. The authorship of the saying is unknown.
 
   
Twitter
Freddie‏
@GiveMeY0urL0ve  
Sweat is fat crying. http://tumblr.com/xjy2gzkbeh
7:49 PM - 10 May 11
 
every day is a runway
Monday, June 27, 2011
sweat is fat crying
don’t be jealous, be inspired!
it’s summer, it’s hot, you know you’ve secretly been dying to shed some pounds or just get fit!
 
Twitter
Nelson Morales‏
@TrainerNelson  
Awesome quote I read, “Sweat is Fat crying. How much is your fat crying? http://ow.ly/5v6nc  #childobesity #parents #moms
1:03 PM - 1 Jul 11
 
OCLC WorldCat record
Ju‏
@sketchbooksix  
ahah just found a picture on tumblr that says “Sweat is fat crying” - http://j.mp/pTWHFY
2:31 AM - 11 Jul 11
   
Club Vogue
Health & Fitness motivational quotes
Coco’s Mummy
21-09-2011, 02:45 PM
My favourite two are:

1. “Sweat is fat crying”
2. “No matter how slow you’re going, you’re lapping those people on the couch”
 
MKDesign & Décor
25 September 2011
Sweat is Fat Crying
Oh my gosh, this is totally how I felt as I worked yesterday at removing the nasty, torn up fabric from my garbage-scored French country armchair yesterday afternoon.
 
Google Books
Get Off Your Ass and Run!:
A Tough-Love Running Program for Losing the Excuses and the Weight
By Ruth Field
New York, NY: The Experiment, LLC
2013
Pg. 89:
After all, sweat is fat crying and hopefully you will have produced oceans of tears already.
     
Polk County (OR) Itemizer-Observer
MINI-MARATHON: Independence Day dash brings number of success stories in 41st year
MONMOUTH/INDEPENDENCE—Chris Reed spent four seasons competing for the Western Oregon University track and field team and he left his mark on the record books, too: he still owns the 5,000 and 10,000-meter school records, set in 2011.
Nicole Watkins
July 10, 2013
(...)
Nine women who started a “Couch to 5K” program through Curves gym in Independence followed through with their racing goal in Thursday’s 2.6-mile run, complete with matching purple tank tops that included a slogan worth noting: “Sweat is fat crying.”