Which of the following is an example of a physical stressor?

Physical stressors are factors that can directly affect the body’s physical state and lead to physiological responses. Excessive exercise without proper rest is a prime example of a physical stressor because it can lead to fatigue, overuse injuries, muscular strain, and even impact cardiovascular health. When the body is pushed beyond its limits without adequate recovery, it can cause hormonal changes, increased heart rate, and muscle tension, all of which are signs of physical stress.

In contrast, the other options pertain to psychological or social stressors. A disagreement with a colleague, poverty and financial issues, and receiving negative feedback can all lead to emotional or mental stress but do not directly impact the physical state of the body in the same way that excessive exercise does. Thus, the correct answer highlights a scenario where the physical demands placed on the body can lead to stress and adverse health effects.