Which of these is not an effective way to gauge the level at which your body is working during exercise?

a.) perspiration
b.) heart rate
c.) talk test
d.) thirst

The correct option for above statement is:

Talk test

Talk test does not require any physical work so it is not an effective way to gauge your body during exercise.

Explanation:

Talk test is something that doesn't require any work or physical activity.So if one need to gauge the body during exercise he cam adopt this activity.

doing something can distress you in any way you can