When the sport of pole vault was invented, the pole were dramatically different from those used in competition today. The poles where simple bamboo sticks that were planted into a sand pit. Bamboo is not very flexible and therefor would cause the athlete to use a straight pole technique that also varied from those used today. An athlete would stick the pole in the ground and immediately begin to work his or her hands up the pole as if they were climbing a rope in gym class. When near the peak of the vault, they would kick their legs up in hopes to clear the bar.
After years of pole vaulting with stiff bamboo sticks, the world record became harder and harder to break as the technique and pole type had not changed. This was the case just before World War II which would soon change due to the war itself. America normally obtained its bamboo poles from Japan who soon became enemies with America after the egregious attack on pearl harbor. This caused the American pole vaulters to use steal poles which were very stiff and rugged to use. The war itself did not help the sport at all as it create a paucity of top pole vaulters as most were drafted and killed in the war creating no competition to the lucky men who were not drafted.
After the World War II had ended, the world record had remained the same for countless years. It was time for a change. Fiber glass poles made their way into the circulation of the sport and changed both the level (pun intended) of competition, and the form forever. The bend of the pole allowed athletes to transfer their energy created by running more effectively and efficiently than ever before. If you were to try pole vaulting, there would be weeks of hard straight polling but soon enough you would have the joy of handling the bend. Doesn't it sound tempting to rid the bend and see what happens?