a high heart rate is a message from your body that you are
a. not working hard enough
b. straining
c. going to have a heart attack
d. in perfect physical health
The answer is B, straining. Explanation: straining is when you force ones body or oneself. Normally a high heart rate is a result of working too much. A high heart rate is also the cause of a heart attack, HOWEVER (C) is not correct.
