When setting realistic goals, it is important to keep in mind:
a.
your current level of fitness
b.
what you eat
c.
what time school starts
d.
how old you are

When setting realistic goal it is important to keep in mind the current level of fitness, what we eat, at what time the school starts and how old we are. Hence all the options are correct.

Explanation:

For setting realistic goals all the things should be kept in mind so that the goal should not be failed. And the routine which is made by the person should be followed every day and with proper discipline.

To get maximum result a person should follow the diet plan and all the exercises plan properly and daily. As we all know that consistency is the secret to achieve anything and it is more important in the case of physical fitness.  

b. they impair judgment, which makes it more likely for people to engage in risky behavior.