Running at full force into a stationary object just to hurl yourself off and get the mostheigh possible? Sounds fun right? Well physics makes this possible. By the time you get to the vaulting table you want to be at the highest speed possible and get the perfect angle so you can get as high as possible and stick the landing, but you also want to get far enough so you dont risk hitting the table. The further you run from then the more you can accelerate to your fastest speed untill your speed remains constant, which around this time you would hope to be in front of the spring board. You also have to take in consideration the height of the table that way your hands hit the table at the perfect time from the perfect height in that way your body in-line for you to makw the best possible landing. Vaulting is basically turning yourself into a controlled human projectile.