The bones of the body have to be strong for better functioning and performance of the body at the same time the body should be flexible. Similarly the foundation of any structure have to be strong and flexible at the same time.
Why flexible materials are used in buildings in earthquake prone areas?
The joints and beams in the structure of buildings are constructed in such a way that in case of a seismic event the shocks and the shaking of buildings can be resisted by not letting the buildings to collapse.
The buildings do not collapse due to the flexibility of beams , which bends a little to resist from collapsing. This concept also relates to the bending of knees after hitting the ground while jumping. This disperse the sudden impact and force on several parts and helps in landing successfully.
Therefore, When you hit the ground after jumping, your knees are slightly bent instead of being straight is the same as the using flexible materials in buildings that may be hit by an earthquake.
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