To estimate the power generated by a person climbing stairs, one must consider the energy expended over time. Power is defined as energy per unit time, so calculating the work done against gravity provides a basis for estimation. While the exact energy from metabolic processes is difficult to quantify, an approximation can be made using the change in gravitational potential energy as the person ascends. This approach assumes a constant climbing speed, simplifying the calculations. Understanding these principles allows for a reasonable estimation of the power output during stair climbing.