A woman named Sarah might be toning at the gym. This should not be confused with “serotonin,” but there are “Sarah Tonin” jokes.
   
“What do you call a female biologist who goes to the gym? Sarah Toning #nerd” was posted on Twitter by Vegedow on April 18, 2013. “When I’m at the gym they call me Sarah Toning get it?!?” was posted on Twitter by Nicole D’Angelo on February 10, 2014. “What do you call a really happy girl who goes to the gym all the time? Sarah tonin’” was posted on Twitter by Max and Sam on June 12, 2014.
   
“Why was Sarah smiling at the gym?  Because Sarah tonin…” was posted on Twitter by Biggs on January 18, 2022. “Why was Sarah smiling at the gym? Because Sarah-tonin” was posted on Reddit—3amjokes on January 19, 2022.
 
 
Wikipedia: Serotonin
Serotonin (/ˌsɛrəˈtoʊnɪn, ˌsɪərə-/) or 5-hydroxytryptamine (5-HT) is a monoamine neurotransmitter. Its biological function is complex and multifaceted, modulating mood, cognition, reward, learning, memory, and numerous physiological processes such as vomiting and vasoconstriction.
     
Twitter
Vegedow
@KVegedow
What do you call a female biologist who goes to the gym? Sarah Toning #nerd
9:37 PM · Apr 18, 2013·Twitter for BlackBerry®
   
Twitter
Nicole D’Angelo
@NicoleDAngelo7
“When I’m at the gym they call me Sarah Toning get it?!?” Lmfaooo
@worldofrochelle
11:14 PM · Feb 10, 2014·Twitter for iPhone
     
Twitter
MS. BRIGHTSIDE
@msbriightside
“Hey Sarah if you were weight lifting at the gym you would be Sarah-tonin” #ThanksJared
1:15 PM · Mar 31, 2014·Twitter for iPad
   
Twitter
Max and Sam
@themaxandsam
Great news guys.
What do you call a really happy girl who goes to the gym all the time?
Sarah tonin’.
9:16 PM · Jun 12, 2014·Twitter for Mac
   
Twitter
S W S
@samwestonshep
Who the fuck is Sarah Tonin and why is everyone in the gym saying how good she’s making them feel
3:50 PM · Apr 9, 2019·Twitter for iPhone
 
Twitter
ҍօօҍ-օօ-ɾɑҍҍíԵ (me/me/mine)
@StrangerTings5
Sarah: I’m going to the gym to cheer me up.
Me: I’ve always thought you have low Sarah toning levels.
Sarah:
10:40 AM · Nov 15, 2019·Twitter for Android
       
Twitter

Sarah Gibbs
@SarahG1225
Me at the gym: serotonin, but also Sarah-tonin’
2:35 PM · Jan 7, 2020·Twitter for iPhone
     
Twitter
ur dads favourite stepsis
@_cocainecharlie
Replying to @sleepycava and @snoccc
She might be at the gym, Molly mentioned something about Sarah toning
10:58 AM · Jan 25, 2020·Twitter for iPhone
 
Twitter
ROB LIEFELD TEDDY BEAR
@notKoze
I met my girl Sarah Tonin at the gym.
6:31 PM · Aug 19, 2020·Twitter for iPhone
     
Twitter
Beard Cat
@theycallmenavy
What do you call a woman who goes to the gym to stabilise her mood?
.
.
.
.
.
Sarah Toning
12:23 PM · Sep 3, 2020·Twitter for Android
 
Twitter
snacky
@candyflippin
went to the gym looking for my friend Sarah, and guess what I saw? Sarah tonin’
9:49 AM · Nov 4, 2020·Twitter for Android
   
Twitter
William Newberry V
@GoreMiser
If you’re depressed just get a friend named Sarah that likes to go to the gym. Everyone’s happier with Sarah tonin’
2:05 PM · Nov 21, 2020·Twitter for Android
 
Twitter
Alex Sol Watts
@solwat
Why was Sarah so happy after her Pilates class?
Because Sarah tonin’
6:17 PM · Jan 2, 2021·Twitter for iPhone
       
Twiutter
Jay
@whiskeywh0re
I changed up my home gym routine, now Sarah Tonin and I are best friends
1:01 PM · Feb 1, 2021·Twitter for Android
     
Twitter
Fairy Gay Blige
@_alexande_R
Why is Sarah always in the gym?
Sarah Tonin’ .....
10:19 AM · Mar 12, 2021·Twitter for iPhone
   
Twitter
Professional Dipshit
@MaybeMandap
Replying to @meethebuns and @bleachhpls
Sarah going to the gym to build up muscle. Sarah tonin’
4:31 AM · Mar 23, 2021·Twitter for Android
   
Twitter
dog twink
@girltwinkmoder
sarah at the gym, call that sarah tonin
8:49 AM · Jun 24, 2021·Twitter for Android
 
Twitter
tom
@bovrilstan
A woman has been working on her glutes at the gym and she’s really happy with her progress thus far…
Sarah toning
9:22 PM · Jul 12, 2021·Twitter Web App
 
Twitter
Thorny Devil
@HutchenceD
There’s this fit girl I see whenever I’m leaving the gym, and seeing her workout puts a smile on her face. I call her Sarah, Toning.
6:15 PM · Sep 10, 2021·Twitter Web App
 
Twitter
Biggs
@DJBiggnness
Why was Sarah smiling at the gym?
Because Sarah tonin…
9:53 PM · Jan 18, 2022·Twitter for iPhone
   
Facebook
Quitman Stephens
January 18, 2022 at 10:21 PM ·
Uncle Q’s Joke of the Day (#UQJOTD):
Why was Sarah smiling at the gym?
WAIT FOR IT…
WAIT FOR IT…
WAIT FOR IT…
WAIT FOR IT…
WAIT FOR IT…
WAIT FOR IT…
WAIT FOR IT…
WAIT FOR IT…
WAIT FOR IT…
WAIT FOR IT…
WAIT FOR IT…
WAIT FOR IT…
WAIT FOR IT…
WAIT FOR IT…
WAIT FOR IT…
WAIT FOR IT…
WAIT FOR IT…
Answer: because Sarah tonin’
#rimshot #comedy #UncleQ
 
Reddit—3amjokes
Posted by u/AvatarConscious January 19, 2022
Why was Sarah smiling at the gym?
Because Sarah-tonin
   
Twitter
Gerston Blenman
@GerstonB
I’ll be damned if I leave this earth and not get the chance to ask Why was Sarah so happy in the gym ?!
Because Sarah-toning .
8:10 AM · Jan 19, 2022·Twitter for iPhone
 
Twitter
joke of a guy
@the_alphaman_
Why was Sarah smiling at the gym?
Because Sarah tonin
#humour
12:02 PM · Jan 19, 2022·Kipruto