How much more evidence do we need, that exercise is good and any amount is better than none?
With the caveat that I'm just a random non-expert on the internet who has nevertheless spent too much time reading scattered studies and scholarly opinion articles:
We don't need "more" evidence exactly, but rather a better model of how the effects of exercise map to a given individual's physiology. Exercise is good overall, but it's also considerably overhyped due to a procession of weak and narrowly-applicable results being misconstrued as adding up to a massive pile of benefits that applies to the average person. In reality, the average person does not get anywhere close to the sum of all the touted benefits; they get some constellation of some of the benefits, while other outcomes are flat or even regress [1].
So yes, "exercise is good" at a sufficient level of abstraction, but it's much harder to make the case that it's "good for [specific outcome] for [specific person]". Which is one reason that it's such an obnoxious trend for specific health complaints to be met with generic recommendations to exercise (or exercise more, or exercise differently).
Until society has better work-life balance to allow for exercise while allowing for cost effect doctor visit to assign supportive and recognized improvement. Cheerleaders are more useful then people think.
The detail is in how regular are the exercises? Doing one hour at end of day after sitting 8 hr straight is worse then spreading it out.
Of course doing 1 hour a day is better than nothing but it may not be effective
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Well, I personally do not.
I was about to be put in blood pressure medication. Then I started a gym, with a trainer. I noticed that, after the exercise, blood pressure would immediately drop and stay low for a few hours.
Over time, the amount of time it spent lower than average increased, and it got lower and lower. It crossed 24h.
Now? I can go to the gym Mon/Wed/Fri and it will remain low at all times. I did stop for a couple of weeks and it started creeping back up so it's not a 'cure', but functionally, as long as I keep it up, I have normal BP.
I still have some weight to lose, that can further help things, most likely. And removing sugars also did help since I dropped a lot of liquid I was retaining.