"Physical stressors" refers to external factors or conditions that put strain on the body, causing it to endure physical pressure or demands. Full definition
This applies equally to both psychological stressors as well as physical stressors such as adding endurance training on top of three strength training workouts which is what happened in this study. (predatornutrition.com)
One of the major physical stressors we are all under on a consistent basis is gravity. (drjockers.com)
As the body's primary stress hormone, cortisol can easily get kicked into overdrive — not just from mental stressors like a stressful job or relationship, but also from physical stressors like an undiagnosed food intolerance or lack of sleep. (bodyunburdened.com)