I tried to imagine forces that would require such strength.

It can be said that this kind of research requires not only knowledge, but also physical strength.

The moves are simple in nature and require great strength.

Yet with care the First was able to pick a passage which did not require much strength.

It wouldn't have required great physical strength on the part of the murderer.

And what followed, however she chose, might require even greater strength.

Turning her board, which was heavy and stiff, required more strength than she had.

It had been quite a neat job and one requiring little strength.

It might be because football requires physical strength most teenagers do not have.

It's clean, doesn't require physical strength and you won't end up covered in your victims blood.