Where does a spring in a ball point pen or a pogo stick get its energy?

The spring gets its energy when it gets pushed down because it makes an effect to make the pen come out

Explanation:

micro/nanoscale topography surface exhibits many prominent properties and is extensively employed in biomedical device, microfluidic device and energy device fabrication. additionally, the clinical applications of biomaterials can be largely expanded with of nanostructured surfaces.

there really is life in the deepest part