When exercising, you should
(a.) plan to take in extra water.
b. avoid wasting time with a warm-up.
c. work through any pain that you experience.
d. plan to take in extra protein.

A) taking in extra water can result in cramps so it is not A B)you should do warm up,So that the body would be ready to handle the sudden increase in body speed,So it is not B C)working through any pain,is good at some reason but not on all the experience so its not C D)you need to plan on taking proteins,Proteins helps in strengthening in bones and helps in the supply of oxygen to the cells(for eg tennis players eat a banana before,middle and after the game or gym workers take protein bars to work out more)