I made this Cause and Effect Flow Chart to help the YW visualize what they need to do to have a proper fast. They can also see what effects or blessings they can have in their lives by participating in a proper fast.
This handout can be used with the "Come Follow Me" lesson: Why do we fast?
You can download the file HERE
You can find the "answers" for the boxes under the "prepare yourself spiritually" part of the Why do we fast? lesson on lds.org. Just match the scriptures to the summary in the parenthesis.