Exertion refers to effort that can be both physical, like running, or mental, like studying. The mental exertion of preparing for exams left him exhausted.
Pro Tip 2/3
Visible Signs
Exertion often shows visible signs, such as sweating or looking tired. She wiped her brow, showing signs of exertion from the hike.
Pro Tip 3/3
Intensity
The word can imply different levels of effort, from minimal to extreme. He made an exertion to smile despite his nervousness.