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Hmm, maybe I just wanted to prove that I don't need it? Or maybe I don't care? :)
Well, never mind.
...Of course, it's needed, if you don't want to be like my father at 40 – with a big belly, high blood pressure, and constantly grunting when bending over. If you don't want to shake the table so much when getting up from it and leaning on it that everything spills out of the cups, it's needed if you don't want to suffer from shortness of breath, fatigue, stress, and other migraines associated with an unhealthy lifestyle – minimal movement with maximum food intake. If you don't want to lie on the couch after dinner, panting, almost suffocating, and replace the couch after a year "because it's worn out."
Hmm, this is all a personal example (fortunately, not experienced firsthand) – it's a sore subject.
I saw in the news today that 30% of senior officers suffer from obesity.
But... there are also healthy people. For example, a 50-year-old officer, I saw him, and if it weren't for the gray strands, I would have given him no more than thirty.
He was doing handstands. He does 20 pull-ups and, after a minute, does 70 push-ups.
No health problems. No blood pressure, no arthritis, nothing.
So, do we need a healthy lifestyle? :)