How could professional football players use technology to better understand their health

Explanation: Professional football players or any athlete can use many technologies such as health apps, sugar machines, BP machine,weighing machine and smart watch to better understand their health. They can use these technologies on daily basis to check their body mass index (BMI). They can also use smart watch and health apps to calculate their net calorie count of a day and maintain their nutrition level.

a and b sometimes have a positive value

answer; how far out of place which the object finished relative to the starting location;