Are there any books pamphlets or articles on how to train to play at GM level? CL&amp;R had an article about how Fischer trained at a spa in the Adirondacks for an upcoming match.  

One thing he did was swim and also hold his breath for as long as he could.  Not sure that latter was good. 

Recent reports have Caruana and Chirila going for long runs, playing tennis, basketball, and also swimming.  

Anand does 2 hours of cardio each night to help stop him from dreaming about chess.  

Carlsen went to the Olympic center with his father and they had him change his diet.  Less orange juice with sugar and substitute a mix of chocolate/regular milk.   He also trained by skiing and hired a personal chef to balance his carbs protein, and calcium.

Carlsen even optimized his sitting position.   

Further he reduced his schedule to about 7 tournaments a year instead of about 13.  And took time off after each to recuperate.  

So GMs do many things other than study chess.  Are there any books or good articles prescribing what would be best for training our bodies to play tournaments not just learning chess more itself.
I do not think that there are any books devoted specifically to this topic, probably since the subject is not big enough, and most physical training is covered by books devoted to that subject, in general (not with chess in mind). The topic may be touched upon in other books.

For example, probably first to take a modern approach to training the body was Kasparov, and his trainer goes into that in his two-volume series on Kasparov's development. In fact, on the cover of volume 2, you can see a picture of them running. Even so, the book does not spend a lot of time on this aspect as most people are more concerned with the purely chess aspects of his training.

Coaching Kasparov, Year by Year and Move by Move, Volume I + 2 by Alexander Nikitin.

I believe that Botvinnik was probably the first to espouse the benefits of physical training SERIOUSLY, and I have seen this written about in passing, but again, there was not enough material for a whole book.

Here is a nice article on Botvinnik on "Sports Illustrated". It discusses his physical training a little.

Here is another webpage that discusses the training activities of various modern GMs.

Here is another very good article on the subject. "How physical activity can help you play chess better?"