Working for a bigger company I’m hesitant to go for a walk as that would mean I need to stay longer in the afternoon/evening. Even when going for a walk solves the problem, there is still little acceptance to count it as working hours. I think this mentality should shift somehow as it would benefit the company and the employee.

There's a couple of solutions to this:

1) Find an employer who doesn't pay by the hour (but e.g. per day or task/goal)

2) Find an employer who isn't strict on the hours.

3) Self employment.

4) Find or convince an employer who accepts this.

None are ideal, except for #4, but its the long breath.

And I am thoroughly convinced it works. Same with workout, mindfulness. Such behavior should be rewarded. My employer supports workout in the sense I get 1 hour per week paid leave for working out.