“Why didn’t the acrobat work in the winter?”/“He wanted to do summer-saults.”

“Somersaults” can be performed at any season, but there’s a riddle:
 
Q; Why didn’t the acrobat work in the winter?
A: He wanted to do summer-saults.
 
“Q. Why don’t acrobats work in the winter? A. They only do Summer-saults” was posted on Twitter on January 30, 2010.
   
   
Wikipedia: Somersault
A somersault (also flip, heli, and in gymnastics salto) is an acrobatic exercise in which a person’s body rotates 360° around a horizontal axis with the feet passing over the head. A somersault can be performed forwards, backwards, or sideways and can be executed in the air or on the ground. When performed on the ground it is typically called a roll. Somersault originates from an obsolete French word, sombresault, from Occitan sobresaut; and ultimately Latin – supra, “over”, and saltus, “jump”.
   
Twitter
HughNitedNations
‏@hdiddydollar
“mid-winter and I got these girls doing ‘summer’ saults” - @NickelusF
10:23 AM - 30 Dec 2009
 
Twitter
Pump It Up Freehold
‏@piufreehold
Q. Why don’t acrobats work in the winter?  ...
A. They only do Summer-saults.
10:55 AM - 30 Jan 2010
 
Thalassaemia Australia (Winter 2010)
Pg. 16:
Q: Why don’t acrobats perform in the winter?
A: Because they only do summer-saults!
 
Twitter
Popsicle®
‏@Popsicle
#JokeOfTheWeek Q. Why don’t acrobats work in the winter? A. They only do summer-saults.
3:08 PM - 5 Jan 2011
 
20 June 2012, Northwest Herald (Woodstock, IL), “Kid Scoop,” pg. B4, col. 4:
Why don’t acrobats work in the winter?
A: They only do summer-saults!
Donny,
3rd grade
 
Twitter
Ellen DeGeneres
‏@TheEllenShow
Why didn’t the acrobat work in the winter? He wanted to do summer-saults. #ClassicJokeTuesday
7:13 PM - 15 Jan 2013
 
Twitter
Pacific Coast Speech
‏@PCSSinSoCal
Why didn’t the gymnast work in the winter? Because he wanted to do summer-saults! #SLPeeps
9:40 AM - 27 Jan 2016