@ krondys
Apologies - I didn’t realize that was a show related comment. I don’t recall that from the show, but very likely. That was the entire point, his training regime was quite unorthodox.
In real life, when British comedian Eddie Izzard decided that he needed to get in shape, he did it by running a marathon every day, until he completed the circumference of Great Britain. When he started, he was taking 8 or 10 hours to finish each one, but got down to a much more respectable time by the end.
Did Kellogg’s change their claim over time? Because long ago in my youth I think they claimed that Frosted Flakes were part of “a complete breakfast.” The picture that accompanied that statement showed a bowl of cereal (maybe with sliced bananas, I don’t remember), two slices of white bread toasted and buttered, and a glass of orange juice. Even back then I’d wonder at the claim, since breakfast at my house might include cereal or toast, but never both.
And no heat in the cold. (I think that had more to do with being cheep than with the actual workout
It was a world where someone can become a crab from eating too many crab legs. Dedication to becoming the world’s greatest hero means that he will become the world’s greatest hero, as long as he keeps up his dedication.
The exercise was not that strenuous (though more than most of us do in a day.) It was the dedication that was the hard part. Putting up with hardship, discomfort and pain, and doing it every day for 3 years is actually pretty impressive.
To the OP. I would not expect your son to gain superpowers from the exercise, but he may learn something about dedication and following through on something, even when it gets hard.
In the unlikely event that he does gain superpowers, come back and give us an update, would ya? 
@Anny Middon
I think if you look closely, they also had an egg or bacon in the photo, so they had carbs and protein.
When I was a young marketer, our company did a cross promotion with Kelloggs. When we met them, someone from our company jokingly asked about that phrase: How they could get away with calling all these sugar cereals “nutritious”.
They responded that it was brilliant marketing: They’ve never said *the cereal *was nutritious, they say the breakfast is nutritious. In fact, their product manager joked, that you could put dog turd in the bowl and still say it’s part of “this nutritious breakfast”.
Although I love marketing, I was very disappointed and disillusioned by that and realized then that it could be a force for evil.