Hi:
It is just a show. One of the trainers admitted that the amount of weight lost depended on the diet and that exercise had little to do with the weight loss: 5-2-diet-chat-f6/diet-beats-exercise-for-weight-loss-biggest-loser-trainer-t7846.html?hilit=exercise loser#p89956
However, watching people sit around not eating does not make much of a show, so they put in the massive amounts of exercise for its entertainment value.
If you like to watch people being tortured for no real reason other than entertainment, I guess it is fine.
It is just a show. One of the trainers admitted that the amount of weight lost depended on the diet and that exercise had little to do with the weight loss: 5-2-diet-chat-f6/diet-beats-exercise-for-weight-loss-biggest-loser-trainer-t7846.html?hilit=exercise loser#p89956
However, watching people sit around not eating does not make much of a show, so they put in the massive amounts of exercise for its entertainment value.
If you like to watch people being tortured for no real reason other than entertainment, I guess it is fine.