Physical stress refers to the body's response to external pressures or demands that exceed its capacity to cope. This can occur due to various factors, such as intense exercise, injury, or environmental conditions. When faced with physical stress, the body activates its fight-or-flight response, releasing hormones like adrenaline and cortisol to prepare for action. Chronic physical stress can lead to negative health effects, including fatigue, muscle tension, and weakened immune function. It is essential to manage physical stress through techniques like exercise, proper nutrition, and adequate rest to maintain overall well-being and prevent long-term health issues.