Well, the controls were simple enough, and the new driver was not given to nervousness in the face of physical difficulties.

The particular physical difficulties of the site stimulated interesting solutions to construction problems.

Apart from the physical difficulties, he also had to face up to the mental stress of completing the task.

Stress and physical difficulty are considered harmful to the healthy development of pregnancy.

But people who have spent time with the pope say that for all his physical difficulties, he remains mentally acute.

If he becomes nervous about eating, it will make his physical difficulties worse.

It must be remembered, too, that this work was done under great physical difficulties.

It's also no longer a surprise to hear about the mental and physical difficulties of professional football.

Sure, there is little physical difficulty to flying a plane, but that entirely misses the point.