(Beware: this is a mix of opinions about space exploration, medical advice, and mathematical education, and social commentary, so pardon the whiplash.)
When I say 'we', I mean current first-world medical opinion is that daily exercise is important. Driving in cars, little walking, hyper-sugarfied drinks, large servings at restaurants, obesity cardiovascular disease, we are bombarded by personal advice and the fitness-industrial complex to exercise even if you have to drive to the gym.. Treatment for rich people diseases (and being in the first world nowadays allows some measure of curability/treatment either via surgery or lifestyle changes (diet and exercise)) are just not available in the third-world. They're just trying to get by, to make it through the day. They'd love to have the opportunity and control in their lives to eat more than they need or leisure time to rest, instead of having to walk 5 miles to get tainted water (or in inbetween countries, only get tainted water through the plumbing).
Many life threatening problems are so addressable by medical techniques that it is the relatively minor annoyances that have become sever medical crises in the first world, like Alzheimer's or social anxiety. The third-world is just trying to have subsistence level nourishment, not die from diarrhea or fever from infectious disease. (pardon my usage of the first vs third world terms. They are easier to distinguish whereas 'developed' and 'developing' are not).
Presumably before the industrial age (or becoming developed), people got lots of exercise walking around. Yet they died much younger. If it weren't for infectious disease, would they have had a longer life-expectancy?
It's not like exercise is some fancy new idea, it has been around forever. It's just that right now it is a public business. Even within the US, it is a bit of a rich vs poor distinction: those who have the money and time can exercise, but those who work two jobs and have kids really don't (one might ask if poor/busy people don't get lots of exercise naturally just by activity level...).
It has been well documented and studied that astronauts who spend lengthy times in space (weeks and months) as on the no-gravity ISS (International Space Station) have osteoporosis and muscle weakness. In order to counteract this they have as part of their schedule a rigorous exercise plan,
much more rigorous than on Earth. In fact, it has to be much more rigorous to account for the lack of gravity. The gravity on earth is naturally exercising us constantly. Just standing up on Earth we are using muscles from our legs and torso, even sitting is using your back. On the ISS, the zero-gravity environment is like lying down all the time. An astronauts schedule includes a couple hours a day on an exercise bike, or 'weight' lifting. (also, you can do a triathlon in space, but the swimming portion is hard)
You go to space and one particular feature of that environment which should be considered a great facilitator, the lack of gravity, has an effect on our biology which is expecting a much less lenient situation. And the biology pulls the other way. (I've heard that some-impact exercise like walking can be better than bike-riding, which is no-impact, because it encourages bone regrowth that counteracts osteoporosis. I've heard)
Which brings me to calculators in the math class (obviously). Or even computer aided algebra or automated proving systems for academics (and sometimes for engineering).
Kids these days, they can't even do long division! They've been coddled by calculators! How do we expect them to do science, let alone balance their checkbooks?
Calculators (and computer algebra systems to the nth degree) do the calculation for the user. Multiply two 10 digit numbers? A tedious exercise for a person, but a natural fit for a calculator. Solving that integral with square roots and trig symbolically? For a math/engineering whiz it's an hour long homework problem, but for the CAS, it's a natural fit. Solving it numerically? Insane for a person, but a natural fit again for the CAS.
The calculator (and CAS) is not intended to be a crutch that ends up weakening the user making them dependent. It makes you go that much further than you ever could go on foot.
A car takes us hundreds of miles in a day that we would never dream of doing on foot. If it makes us a bit lazy in taking the car for a few hundred yards, well, that's when we have to make sure we walk.
Technology puts us in the first world, but then we have to remember to exercise.
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