Related to post #1647332 and post #1662366.

I remember seeing this position in one of my social studies book...

For heavier bow.
There's also crossbows designed to be charged by using feet from laying position. The leg's muscle are stronger than arm and the process is faster than the pulley or lever variety.

Seika said:

For heavier bow.
There's also crossbows designed to be charged by using feet from laying position. The leg's muscle are stronger than arm and the process is faster than the pulley or lever variety.

something like this?
https://www.youtube.com/watch?v=L6EknwERf3o