If your workout exceeds an hour, you should substitute for water
a. a sports drink b. whole milk c. diet soda d. fruit juice

answer; /// i believe that the correct answer is (d); /// alternate walking and running;

it's false.

"every person has their limitations which prevent us from accomplishing something. some are better than mathematics for example and some are worse. those people who are worse might never be able to become mathematicians, but that does not mean that they would not be great at doing something else."