man's strength when he was already trying
his ``best,'' and whether he could continue
to work after he was ``completely exhausted.''
I put each man at work on machines which allowed
him to exert himself to his utmost and
measured his accomplishment. While he was
thus employed, the coach began urging him to
increase his exertion. Ordinarily the increase
was marked--sometimes as much as fifty
per cent.

Again, when the man had exhausted himself
without coaching, the extra demand would
be made on him; usually he was able to continue,
even though without the coaching he
had been unable to do any more. There was,
of course, a point of exhaustion at which the
coaching ceased to be effective.

_The tests proved conclusively that when a man
is doing what he believes to be his best, he is still_

_able to do better; when he is completely exhausted,
he is, under proper stimulus, able to continue_.

Before a horse is started in a race it is
vigorously exercised, ``warmed up.'' To the
uninitiated this process seems so strenuous
as to defeat its purpose by wearing out the
strength of the horse. Every horseman knows,