Yes, all sorts of exercise might be continued in that way, and the more I take exercise the better I shall sleep at night and enjoy my meals.

Yes, with nothing else to do I might become almost a Samson here.
"There, now my whole time is marked out--escape from prison, and exercise.

I'll try the last first, and then think over the other." For a long time Rupert worked away with his furniture until he had quite exhausted himself; then feeling happier and better than he had done since he was shut up, he began to think of plans of escape.

The easiest way would of course be to knock down and gag the gaoler, and to escape in the clothes; but this plan he put aside at once, as it was morally certain that he should be no nearer to his escape after reaching the courtyard of the prison, than he was in the cell.

There remained then the chimney, the loophole, and the solid wall.
The chimney was the first to disappear from the calculation.
Looking up it, Rupert saw that it was crossed by a dozen iron bars, the height too was very great, and even when at the top the height was immense to descend to the fosse.
The loophole was next examined.