Something I've heard before:
"One of the purposes of this life is to learn how to take care of our bodies."
Think of your conception of what heaven will be like. Do you eat or not eat? (Can you?) Can you get hurt or not get hurt? Does your hair grow or not grow? Do you need to sleep or not? Poop? Etc.
Now, tell me if the above sentence makes sense together with your conception of heaven. Why or why not?