The number of coaches assigned to any particular training area is not critical provided all areas are covered. The most important consideration in designing a training regime is the level of intensity in each area. There are four levels None means that a player will not train at all in the discipline. Mainly used for non-essential areas such as Goalkeeping for a forward. Using this level where possible allows an acceptable increase in intensity in other areas.
Light is a 'tick over' level where attributes are unlikely to change.
Medium is the level at which attributes are likely to move upwards. Intensive is the highest level and changes in attributes are more likely. The combined intensity of each training area determines the toughness or otherwise of the training schedule. Set a tough schedule and attributes will change quickly but at the expense of the condition of the player and his ability to perform for 90 minutes. Tough schedules also increase the likelihood of training injuries - which in extreme cases can be quite severe.