In the times that you/they run the physical training it is fundamental to achieve results, of anything he/she serves to have the ablest player in the world if alone it resists a time of game. The complete physical acondicionamiento is complex, because in an encounter one doesn't run in a single way but of several. A player runs in a party 45-50% in Capacity Aeróbica, 20-25% in Power Aeróbica (it is the mixture between capacity aeróbica and capacity anaeróbica), 15-17% in Capacity Anaeróbica and 7% in Power Anaeróbica. Therefore to train like he/she owes to a player we should make them inside these four ways of running, keeping in mind that in some of them we will have great presence of lactic acid therefore it is necessary to manage:

When and how to train each one.
The recovery that takes each one. (this will give us the quantity of times for week that we can
      to train this quality)
How to distance the physical trainings of the party.
To coordinate trainings with presence of lactic acid with those lacking the same one.

Another point to consider and it is a very common error of observing that a work is sometimes made in theory aeróbico but for not managing the range of the players' pulsations some of them they can generate lactic acid then if on the following day we make a work anaeróbico, that is to say that will generate to conscience lactic acid some players they will already have in its muscles something of the same one and therefore they can begin to be injured. In the physical training there is not chance there is causation.
The technicians should manage all these aspects because in the moment that is given an exercise with ball to the player this he/she will have physical load.
We also have to know that players' types have, this is made through several test, because there are people that have the characteristic of "sprínters" and others that have the characteristic of "resistant", this is due to the fiber type that you/they come of "factory", therefore to the first ones he/she won't make him well abuse of the trainings aeróbicos and a seconds he/she won't make him well abuse of the trainings of since speed they are not their natural characteristics (there are examples of mediocre hint corridors that have been excellent maratonistas) to see that type of fibers has each player there are two ways, or a muscular biopsy is made or they are carried out several tests to know which are their qualities, the advisable thing it is the second option because anybody likes it that they take out him a small muscle portion for its study.
As they will see the physical training it is very complex and is it necessary to dominate the energy system very well to understand the why? of the things.
Our way to train physically to a team already has shortly her descripto in the section introduction, here what we want to demonstrate is that many times and for ignorance of the different trainings we can harm our players although we also have examples of teams whose physical coaches take so to the limit to their players that have ended up injuring at 15 of their players, we won't give names but the situation was very well-known. The trainers achieved many titles but to their players' expense and we won't prefix a title to the since player's health we shorten him their useful life, a good trainer has to look for the fair balance between the sport achievements and the health of his facility, at least that it is our philosophy, we can be a lifetime trainers but them alone they can play about 10-15 years.

Marcelo Yaurreche