Vaulting without a board: is referring to a:
Reuther board
(From the article `vaulting`) ...was placed lengthwise, and the vaulting table is placed in that same position whether for men or for women. For men the height of the apparatus is...Found on http://www.britannica.com/eb/a-z/r/40
I'm estimating,
From between the scene drops,
the stage height:
Be sure to look up as you go into your leap. If you look up, the rest of your body will follow. Looking down will keep you low to the ground. As you approach your leap, fixate on a high spot in the distance. Aim to reach that spot...your body will strive to meet the goals you set, so set your goals high. Looking up will not only allow you to jump higher, but will also make for a prettier leap.
Stage drops: the curtains that are hanging on the sides of the stage, creating small corridors to enter and leave...if those corridors don't exist, we speak about a black box as far the drops are hanging around the stage next to each other.
and as far I can see
the distance towards
the unreachable horizon.
The horizon on stage is the big white drop in the back of the stage
