“Why do ghosts go to the gym?”/“To lift, they’re spirits.”

A ghost riddle is:
 
Q: Why do ghosts go to the gym?
A: To lift, they’re spirits.
 
The joke was posted on Reddit—3amjokes on September 1, 2017.
 
   
Reddit—3amjokes
Why do ghosts go to the gym? self.3amjokes
Submitted September 1, 2017by just_another_mexican
To lift, they’re spirits
 
Twitter
3AM‏
@3AM_Jokes
Why do ghosts go to the gym?... To lift, they’re spirits
5:04 AM - 1 Sep 2017
 
Twitter
LOL Tweets™‏
@lolmgco
Why do ghosts go to the gym?
To lift, they’re spirits
6:06 AM - 1 Sep 2017