An average untrained person has a VO2 max of 45 and with training can get it to 60.

That is to allow any untrained person, however resourceful he may be, to lay a finger on them.

Of the several moves they could make right now, few are obvious to an untrained person.

It is difficult for an untrained person to keep track of them all.

It is a heavy pistol and awkward to use by an untrained person.

An untrained person might miss the impending collapse until it is too late.

To an untrained person that could make a very big difference.

An emperor is merely an untrained person who usually did nothing more than be correctly born.

Her mind, assaulted by sensations no untrained person should experience, went into shock.

It often - no, usually - gives directions that can be followed by an ordinary untrained person.