Those volunteers should be physically fit for this strenuous work.

And the strenuous work did help to keep him warm.

But many of them were too weak to perform the strenuous work required.

Success was the fruit of some three years' strenuous work.

I enjoyed the solitude and the change from the strenuous work of the past day.

I would have been worn out by such strenuous work at an altitude of seven thousand feet.

As it happened, the jumping was the most strenuous work Bradley would be required to perform.

After five minutes' strenuous work, Nicolson sat back on his heels.

There comes a time when one has to sit back, and leave the more strenuous work to younger men.

If spring training shows anything, he can endure 40 days of strenuous work.