Here's why:

* Cellular respiration is the process by which cells break down glucose (a sugar) in the presence of oxygen to release energy in the form of ATP (adenosine triphosphate).

* ATP is the primary energy currency of cells, and it's used to power various cellular activities like muscle contraction, protein synthesis, and active transport.

While other processes like photosynthesis store energy, cellular respiration is specifically focused on releasing and storing energy in a usable form for the cell.