Why is there such a huge variation in athletic ability from person to person?

Iwill mark you brainlest if you answer this question

Which type of rehabilitative care would most likely use strength-training equipment?

Aproper cool-down routine includes which of the following? a). eating a good-sized meal b. five to 10 minutes of slow walking or jogging and stretching c). less than 5 minutes of cool-down stretches d). sprinting or other strenuous exercise