Ok, guys, I appreciate the time invested (honestly), and this is the internet and all, and seems that I hit the nerve somehow or something. But the tone of some of you is funny. Honestly. It's only off-putting from the conversation, but I guess some people like to lecture others.
Dogs HAVE to be wormed, regularly. And we are using professional treatments at the vet's office.
I thought that is an obvious thing, but ok, some people probably want to have parasites themselves and won't do it. I accept this. I am very sorry for the poster who lost the eyesight in their eye 
Regarding "where children play" it's not a biggest crime as I haven't seen anyone using the space in the last two months. Not kids, not adults. But during the warmer months, they do. And if by daytime there were people I wouldn't go there at all. We have mostly teens here (who are still kids for me) my child is the youngest one in the area. I get the idea of getting into the poo, but I also think you can't clean everywhere, and we personally prefer to play in the parks and further from home (where there is a lot of different dirt, and sheep sometimes and cows, etc). But I get what a lot of you said and I agree overall.
Someone walk their dog there ( as I mentioned, I am cleaning that poo if I see it there, but I never saw anyone leaving it behind, so I could not ask why they are not cleaning. I guess that is one of the kids (teens)).
So that's not the same as walking your dog on the playground. But I get your point, again. There is no need to lecture me 
Regarding the minute's rule, I never heard it actually. You can run, you can slowly walk, the same amount of time, but different physical load...
I stick to the distance (that is acceptable for the breed and age, the vet is ok with it), and also train him the same time. But I didn't think of it as relevant to post originally, what I meant I am not lazy and I am walking the dog.
Thank you all for your worries and input!!
As I said I'll stick to the bigger area further away.
Garden is not usable atm, neither for the dog or humans, but I'll try to sort that out.