What measures the level of difficulty based on how hard it is for you to complete an activity?

Intensity is what measures the level of difficulty based on how difficult it is for you to complete an activity.

Explanation:

The word "intensity" has many meanings and can be attributed to different branches such as art, feelings, electricity, light, colors, etc.

Among the many meanings, we can mention that this word can also be used to describe how difficult an activity is. Based on this, very intense activities can be considered very difficult, while those less intense activities can be considered little difficult. In short, intensity is what measures the level of difficulty based on how difficult it is for you to complete an activity.

answer; more than 80% percent of adults;

obviously, the latter.