A quiz show is on, people jumping up and down

[AlexanderIII]

Hi, everybody,
This is an expression I've come across in the novel by Adrian McKinty "Fifty Grand".

“My mother,” the man whispers, obviously referring to a white-haired
woman sitting in front of a very large TV. A quiz show is on, people jumping
up and down.
Must a quiz show be necessarily an intellectual competition? If it must how to understand " people jumping up and down"?

 

[ewie]

Hi Alex. You obviously haven't seen many of our quiz shows! ~ most of them are about as intellectual as all-nude mud-wrestling

 

[AlexanderIII]

Hi again, Ewie,
the problem I could not believe the mud-wrestling I can see on our TV is called a quiz show too. I thought it must be intellectual. Now everything is clear. Thank you very much.