Sauna belt is indeed a worst product and the sequence that is being made and shown to the audience is absolute garbage.
All the stories and anecdotes presented in the show are fake and not even a single person from the show can vouch for the product including the anchors.
They show as a person with full if belly fat and suddenly he changes to someone with a six pack.
The plot is bill. The host performance is garbage. Even a person with no on-screen experience can do ten times as much as him.