If you believe something you are pretty certain about it. When you doubt you are uncertain. Referring back to the rules your doubt or certainty is based on some past experience. Guess what? This time machine works in the other direction too.
I can imagine myself in 6-months, say doing a triceps dip contest, and winning against a much younger opponent. Almost did that last year if not for an unscheduled surgery, peaking in training 2-weeks early, and then a small injury a week before. The last little injury impacted the training and caused the doubt.
So do some future tripping and get certain about something you want and then do the work to make it happen.
