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Robin van Persie has revealed that he never stops questioning the managers he works under.

for comments that suggested he was unhappy with the tactics being employed at Old Trafford.

But, while Van Persie later

, he admits that his love for the game and hunger to improve means he is always on his manager’s case.

“As I have got older and more experienced, I have become more sensitive to what my coaches are doing,” said the Dutchman.

“I want to know why we are we doing this or why are we training like that.

“I did not ask those kinds of questions when I was a young player, but now I find it interesting to study why my coaches are making certain decisions.

“I want to know why they do things and why they say things to the players, and why they want to play a certain way.

“I think much more about all those things at this stage of my career. I watch the managerial process all of the time.

“I have had a lot of changes in coaches over the last couple of seasons.

“I was eight years with Arsene Wenger, at Arsenal, and, with Holland, it was a similar steady situation with Bert van Marwijk.

(Image: Matthew Peters / Getty)

Now, in the last 18 months, I changed from Arsene to Sir Alex and now to David Moyes. With Holland, after Van Marwijk, I

, who is a fantastic coach.

“I won’t put one above the other, but I have learnt really good things from each one of them.”

He added: “Certain managers can hit the right nerve with a player. They have that quality.

“I still love my football like crazy. I know there are players who won’t watch a game at all when they are away from football, but I do nothing else but watch games on the telly.

“To me, a good match is like a good movie.”

While RVP takes a more cerebral interest in the game, he does accept that the physical nature of the Premier League has started to take its toll now he has turned 30.

After scoring 30 goals during an injury-free first season with United, the Dutchman has been plagued with familiar fitness problems that dogged him at Arsenal.

“I can’t say whether I am physically stronger now than four years ago or whether I am weaker,” said Van Persie. “We all have pains and aches, but I am convinced that, for every player in the Premier League, it is a struggle to keep fit for a full year.

“The intensity in England cannot be compared to any other football country in the world.

“We have double cup competitions and, if your team is in Europe and you play international games, the workload is incredible.

“I can never stroll through a game. I play – it’s that kind of intensity.

“After 99 out of 100 matches, I am totally exhausted because I want to give everything I have.

“I will never moan about it. I have to handle it like all the other players, but I can tell you that top-level sport is not really healthy.”