If you are 13 years old, what is your maximum heart rate?
A. 193
B. 176
C. 145
D. 200 - 13
E. 100
F. 200 + 13
G. 220 + 13
B. 176
The formula to calculate maximum heart rate is 220 - age. So for a 13-year-old, it would be 220 - 13 = 176 beats per minute.