Concentration

The player is particularly good at focusing thier mind.

The player must make a Concentration check whenever they might potentially be distracted (by taking damage, by harsh weather, and so on) while engaged in some action that requires your full attention. Such actions include casting a spell, concentrating on an active spell (such as detect magic), directing a spell (such as spiritual weapon), using a spell-like ability (such as a paladin’s remove disease ability), or using a skill that would provoke an attack of opportunity (such as Disable Device, Heal, Open Lock, and Use Rope, among others).

In general, if an action wouldn’t normally provoke an attack of opportunity, you need not make a Concentration check to avoid being distracted.