What does borg's scale of perceived exertion tell you? a. your maximum heart rate. b. the level of exertion at which you are recovering. c. the level of exertion at which you are exercising. d. your target heart rate.

C) The level of exertion at which you are exercising.

Explanation: Borg's Scale is used for rating and evaluation of the perceived exertion while doing any exercise and other related physical activities. It calculates the intensity rate with which a person is exercising. Evaluation is done on the basis of heart rate .

Other options are not correct because Borgs's scale is not related to calculation of rate of heart and recovery speed.

Thus, the correct option is option(C).