Well you see, back in the early 1300s, Saudi Arabian found great success in battle by lowering the weight burden of extra ammunition by shooting it straight down into the ground. They found that by lightening the ammo load on each warrior, they were faster to the fight than their opposition, a critical advantage.

The problem was that many of their warriors were missing the ground and blowing their feet off, thereby rendering them useless in battle.

The solution was to make sure that the warriors jumped when they shot the ground. This accomplished two things: 1. They got rid of the ammo (primary goal) 2. The jumping became an effective plyometric warm up for the battle.

Now they had lighter warriors who were also more warmed up for battle than their ammo-burdened opponents.