To develop this problem we will apply the concepts of conservation of energy, specifically the change in elastic potential energy that exists between bodies. Since the model is close to that of a spring, we will look for the amount of potential energy stored for both athletes and sprinters and finally we will calculate the difference between them,

Here,
k = Constant Spring
x = Displacement
Our values are given as,


Displacement non-athletes

Displacement Sprinter

For Sprinter



For non-athletes



Now the total change in Potential Energy is



Therefore the difference in maximum stored energy between the sprinters and the non-athlethes is 8.89J