Every coach is concerned about the training load of their team. The most basic (and most effective, and most correct) method of keeping track of training load is by considering the work to rest ratio of the practice. Most of the time the coach has a stable number of players at practice and at least an intuitive feel for the load of each drill.
The difficulty arises when there is a different number of players from the normal session. In that case, the work to rest ratio will be different from the ‘standard’ practice simply by virtue of the fact that players will be standing around a little bit more or less between repetitions.
So as a general rule of thumb, if you have more players than normal, train for longer. If you have less players than normal, train less.
Less players = shorter practice
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