What have you done before that you wish to do again?
Demonstrate somethings possibility, and it will always be there for you to go back to.
If you have lost 15lb before, you can lose 15lb again.
If you have lifted 300lb before, you can do it again.
If you have pulled yourself up from tough circumstances before, you can do it again.
Maybe it will require a different path.
Or maybe all you will need is to replicate your process.