I will try to write in a way that it is not considered objectionable.
An old joke:
There was this guy who lost 20 kilos in 8 weeks. He was asked by his friend how did he do that?
The first guy said there is a place where you can go and they take you in to a large hall where you are left alone for a while.
Then all of a sudden a good looking girl shows up from no where and says:
“Run fast if you catch me I will be yours forever”
You run after her but she is very fast and after some time she disappears somewhere.
You get all sweaty and tired but eventually lose a whole lot a weight.
Second guy said:
Wow! That’s great, I bet I will catch her if I go there.
Next day he goes to this place, pays his fee and then he was taken to a large hall.
All of a sudden a big, tall and muscular guy enters the room from nowhere and says,
Run fast, if I catch you, you will be mine forever!
