I find myself once again compelled to post.
The first show with "jumping off things" as a design element was 2006 Cadets. We had pink benches that were held up in an angle by a member, and other members ran up them to dive/flip into the arms of a squad of others. The relevant part starts around 6:50 into this video:
How did we work it out? Trial and error. Many heads, faces etc. hit the ground, the benches, etc. Total disregard for member safety and quality of experience. Look at the guard performer's face around 7:06 in the video. That's pure fear.
The visual staff quit Cadets around 2012 and went to Bluecoats...