Most people don't get 75 min of vigorous exercise per week? 10min per day? The average American spend 2x more time watching TV per day than exercising in a week?
The closest thing to an health magic pill we have is exercise and it's virtually free
Most people sit or stand at work for about 8-9 hours and have a little 30-45 minutes of commuting in each direction.
Our entire society is built upon car centric, work centric life and lifestyles. It's easy to blame the individual when you don't suffer the systemic issues that cause these things. A lot of us are fortunate to have flexibility in our hours or finances but this is a bubble.
In my case: If I want to go for a walk or a jog I have to do so on the road. There are no sidewalks within dozens of miles of my location. That leaves me to buy a gym membership and commute back and forth by car. I can't afford that financially at present so I don't.
If I had a safe way of moving more I would be more inclined. I go for walks as regularly as weather, climate, and time allow but they're often cut off by needing to keep my head on a swivel and risking being accosted by folks if I step into their lawns to get out of the way of a car that probably has a distracted driver.
Of course any exercise is better than none, but I suspect the duration of exercise is important to get all the benefits.
Well I guess Im not very tall either I could see that being a problem if you were like 6'4"