I'm really glad to hear it! Yes, of course being an absolute gym rat is (usually) great for you. But it's surprisingly little movement that gives a whole host of benefits.
The problem with so many of those (frankly braggy) threads is that for most people, it all feels so daunting that they don't even start. If you've never been an exercise person, the idea of doing two hours at the gym every single day or going for a 5k run every other day seems so unachievable that most people don't even try, or try for a couple weeks, feel like a failure because they get bored/tired/whatever, and then stop.
The fact of the matter is, really simple little everyday things is all it actually takes for so much of the health benefit. If you're going out and stretching your legs for 20 minutes at lunch, breathing in some fresh air and just getting the blood moving, it'll make you feel better, it'll be great for your health, and it'll help break up the day. It's also really bloody close to 150 minutes of moderate exercise a week, which is what's recommended.
And eventually, you might do it twice a day, or have the family go for a nice walk after dinner in the summer, or a ramble on the weekends, and sooner than you know, you're walking an hour a day. You might want to add things like weights or swimming or HIIT or whatever. But you certainly don't have to.
Exercise shouldn't be intimidating. It's one of the things that keeps people from making small choices with huge impact. Because just going for a reasonably paced walk for 20 minutes at lunch is enough to do huge things for your health and longevity!
If it helps, copied from the New York Times:
"Those who met the guidelines precisely, completing 150 minutes per week of moderate exercise, enjoyed greater longevity benefits and 31 percent less risk of dying during the 14-year period compared with those who never exercised...Those few individuals engaging in 10 times or more the recommended exercise dose gained about the same reduction in mortality risk as people who simply met the guidelines."
(I excised the part where they got into more detail. It looks like the sweet spot is really an hour a day, but it only ticks you up to 39 percent from 31. Which means 20 minutes a day is almost as good for you as an hour, and it's way, way better for you than none.)
All of which is to say, exercising as much as the people on that thread do might be great for how you look, or be an interesting hobby, or be a time to prioritize oneself, or whatever -- but if what you're trying to do is to be healthy, honestly 20-30 minutes a day of reasonably quick walking will be of enormous help.